Serial killer

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A serial killer is typically a person who murders three or more people, [1] usually in service of abnormal psychological gratification, with the murders taking place over more than a month and including a significant period of time between them. [1] [2] Different authorities apply different criteria when designating serial killers. [3] For example, while most authorities set a threshold of three murders, [1] others extend it to four or lessen it to two. [3] The Federal Bureau of Investigation (FBI) defines serial killing as "a series of two or more murders, committed as separate events, usually, but not always, by one offender acting alone". [4]

Murder Unlawful killing of a human with malice aforethought

Murder is the unlawful killing of another human without justification or valid excuse, especially the unlawful killing of another human with malice aforethought. This state of mind may, depending upon the jurisdiction, distinguish murder from other forms of unlawful homicide, such as manslaughter. Manslaughter is a killing committed in the absence of malice, brought about by reasonable provocation, or diminished capacity. Involuntary manslaughter, where it is recognized, is a killing that lacks all but the most attenuated guilty intent, recklessness.

Abnormal psychology is the branch of psychology that studies unusual patterns of behavior, emotion and thought, which may or may not be understood as precipitating a mental disorder. Although many behaviors could be considered as abnormal, this branch of psychology typically deals with behavior in a clinical context. There is a long history of attempts to understand and control behavior deemed to be aberrant or deviant, and there is often cultural variation in the approach taken. The field of abnormal psychology identifies multiple causes for different conditions, employing diverse theories from the general field of psychology and elsewhere, and much still hinges on what exactly is meant by "abnormal". There has traditionally been a divide between psychological and biological explanations, reflecting a philosophical dualism in regard to the mind-body problem. There have also been different approaches in trying to classify mental disorders. Abnormal includes three different categories; they are subnormal, supernormal and paranormal.

Federal Bureau of Investigation Governmental agency belonging to the United States Department of Justice

The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, the FBI is also a member of the U.S. Intelligence Community and reports to both the Attorney General and the Director of National Intelligence. A leading U.S. counter-terrorism, counterintelligence, and criminal investigative organization, the FBI has jurisdiction over violations of more than 200 categories of federal crimes.


Although psychological gratification is the usual motive for serial killing, and most serial killings involve sexual contact with the victim, [5] the FBI states that the motives of serial killers can include anger, thrill-seeking, financial gain, and attention seeking. [6] The murders may be attempted or completed in a similar fashion. The victims may have something in common, for example, demographic profile, appearance, gender or race. [7] A serial killer is neither a mass murderer, nor a spree killer, although there may be conceptual overlaps between serial killers and spree killers.

A motive is the cause that moves people to induce a certain action. In criminal law, motive in itself is not an element of any given crime; however, the legal system typically allows motive to be proven to make plausible the accused's reasons for committing a crime, at least when those motives may be obscure or hard to identify with. However, a motive is not required to reach a verdict. Motives are also used in other aspects of a specific case, for instance, when police are initially investigating.

Attention seeking behavior is to act in a way that is likely to elicit attention, usually to elicit validation from others. People are thought to engage in both positive and negative attention seeking behavior independent of the actual benefit or harm to health. Most behavior that is motivated by attention seeking is considered to be driven by self-consciousness and thus an externalization of personality rather than internal and self-motivated behavior. This type of influence on behavior can result in a potential loss of a person's sense of agency, personality disorder and the behavior associated with these conditions.

Demographic profiling is a tool used by marketers so that they may be as efficient as possible with advertising products or services and identifying any possible gaps in their marketing strategy. Demographic profiling can even be referred to as a euphemism for corporate spying. By targeting certain groups who are more likely to be interested in what is being sold, a company can efficiently expend advertising resources so that they may garner the maximum number of sales. This is a more direct tactic than simply advertising on the basis that anyone is a potential consumer of a product; while this may be true, it does not capitalise on the increased returns that more specific marketing will bring. Traditional demographic profiling has been centered around gathering information on large groups of people in order to identify common trends. Trends such as, but not limited to: changes in total population and changes in the composition of the population over a period of time. These trends could promote change in services to a certain portion of the population, in people such as: children, elderly, and the working age population. They can be identified through surveys, in-store purchase information, census data, and so on. New ways are also in the works of collecting and using information for Demographic Profiling. Approaches such as target-sampling, quota-sampling, and even door-to-door screening.

Etymology and definition

The English term and concept of serial killer are commonly attributed to former FBI Special agent Robert Ressler who used the term serial homicide in 1974 in a lecture at Bramshill Police Academy in Britain. [8] Author Ann Rule postulates in her book, Kiss Me, Kill Me (2004), that the English-language credit for coining the term goes to LAPD detective Pierce Brooks, who created the Violent Criminal Apprehension Program (ViCAP) system in 1985. [9]

Robert Kenneth Ressler was an FBI agent and author. He played a significant role in the psychological profiling of violent offenders in the 1970s and is often credited with coining the term "serial killer." After retiring from the FBI, he authored a number of books on serial murders, and often gave lectures on criminology.

Ann Rae Rule was an American author of true crime books and articles. She is best-known for The Stranger Beside Me (1980), about the serial killer Ted Bundy with whom Rule worked and whom she considered a friend, but was later revealed to be a murderer. Rule was also known for her book Small Sacrifices, about Oregon child murderer Diane Downs. Many of Rule's books center on murder cases that occurred in the Pacific Northwest and her adopted home state of Washington.

Los Angeles Police Department municipal police department in California

The Los Angeles Police Department (LAPD), officially the City of Los Angeles Police Department, is the police department of Los Angeles, California. With 9,988 officers and 2,869 civilian staff, it is the third-largest municipal police department in the United States, after the Chicago Police Department and the New York City Police Department. The department operates in an area of 498 square miles (1,290 km2) and a population of 4,030,904 people.

There is ample evidence the term was used in Europe and the United States earlier. The German term and concept were coined by criminologist Ernst Gennat, who described Peter Kürten as a Serienmörder ('serial-murderer') in his article "Die Düsseldorfer Sexualverbrechen" (1930). [10] The earliest usage attested of the specific term serial killer listed in the Oxford English Dictionary was from a 1960s[ clarification needed ] German film article written by Siegfried Kracauer, about the German expressionist film M (1931), portraying a pedophilic Serienmörder.[ clarification needed ]

German language West Germanic language

German is a West Germanic language that is mainly spoken in Central Europe. It is the most widely spoken and official or co-official language in Germany, Austria, Switzerland, South Tyrol in Italy, the German-speaking Community of Belgium, and Liechtenstein. It is also one of the three official languages of Luxembourg and a co-official language in the Opole Voivodeship in Poland. The languages which are most similar to German are the other members of the West Germanic language branch: Afrikaans, Dutch, English, the Frisian languages, Low German/Low Saxon, Luxembourgish, and Yiddish. There are also strong similarities in vocabulary with Danish, Norwegian and Swedish, although those belong to the North Germanic group. German is the second most widely spoken Germanic language, after English.

Ernst Gennat German criminologist

Ernst August Ferdinand Gennat was director of the Berlin criminal police. He worked under three political systems in his 30 year career as one of the most gifted and successful criminologists in Germany. Among other things, he worked on the cases of Fritz Haarmann and Peter Kürten.

Peter Kürten German serial killer

Peter Kürten was a German serial killer known as both The Vampire of Düsseldorf and the Düsseldorf Monster, who committed a series of murders and sexual assaults between February and November 1929 in the city of Düsseldorf. In the years before these assaults and murders, Kürten had amassed a lengthy criminal record for offenses including arson and attempted murder. He also confessed to the 1913 murders of a nine-year-old girl in Mülheim am Rhein and a 17-year-old girl in Düsseldorf.

In his book, Serial Killers: The Method and Madness of Monsters (2004), criminal justice historian Peter Vronsky notes that while Ressler might have coined the English term "serial homicide" within law in 1974, the terms serial murder and serial murderer appear in John Brophy's book The Meaning of Murder (1966). [11] The Washington DC newspaper Evening Star , in a 1967 review of the book: [12]

<i>Serial Killers: The Method and Madness of Monsters</i> book by Peter Vronsky

Serial Killers: The Method and Madness of Monsters (2004) is a non-fiction true crime history by Peter Vronsky, a criminal justice historian. It surveys the history of serial homicide, its culture, psychopathology, and investigation from the Roman Empire to the early 2000s. The book describes the rise of serial murder from its first early recorded instances in ancient Rome to medieval and Renaissance Europe, and Victorian Britain, and its rise and escalation in the United States and elsewhere in the world, in the postmodern era. The book also surveys a range of theoretical approaches to serial killers interspersed with dozens of detailed case studies of both notorious and lesser known serial murderers, illustrating the theory in practice. Considered by some a definitive history of serial homicide, this was the book serial killer Dennis Rader, the BTK Killer, was reading when he was arrested in 2005.

Peter Vronsky Canadian writer and film director

Peter Vronsky is a Canadian author, filmmaker and investigative historian. He holds a PhD in criminal justice history and espionage in international relations from the University of Toronto. He is the author of the bestseller true crime histories Serial Killers: The Method and Madness of Monsters (2004) and Female Serial Killers: How and Why Women Become Monsters and the forthcoming Sons of Cain: A History of Serial Killers From the Stone Age to the Present. He is the director of several feature films, including Bad Company (1980) and Mondo Moscow (1992). Vronsky is the creator of a substantial body of formal video and electronic artworks and new media. He has also worked professionally in the motion picture and television industry as a producer and cinematographer in the field of documentary production and news broadcasting with CNN, CTV, CBC, RAI and other global television networks in North America and overseas. Vronsky's most recent book was published in 2011, Ridgeway: The American Fenian Invasion and the 1866 Battle That Made Canada, a controversial new history of Canada's first modern battle – the Battle of Ridgeway fought against Irish American Fenian insurgents who invaded across the border from the United States on the eve of Canadian Confederation shortly after the American Civil War. He currently lectures at Ryerson University's History Department in the history of international relations, terrorism, American Civil War, Third Reich, and new military history.

John Brophy (writer) Brophy, John (1899–1965), journalist and novelist

John Brophy was an Anglo-Irish soldier, journalist and author who wrote more than 40 books, mostly based on his experiences during World War I.

There is the mass murderer, or what he [Brophy] calls the "serial" killer, who may be actuated by greed, such as insurance, or retention or growth of power, like the Medicis of Renaissance Italy, or Landru, the "bluebeard" of the World War I period, who murdered numerous wives after taking their money.

House of Medici Renaissance Italian noble family

The House of Medici was an Italian banking family and political dynasty that first began to gather prominence under Cosimo de' Medici in the Republic of Florence during the first half of the 15th century. The family originated in the Mugello region of Tuscany, and prospered gradually until it was able to fund the Medici Bank. This bank was the largest in Europe during the 15th century, and it facilitated the Medicis' rise to political power in Florence, although they officially remained citizens rather than monarchs until the 16th century.

Henri Désiré Landru French murderer

Henri Désiré Landru was a French serial killer. He was nicknamed "The Bluebeard of Gambais" by the French press, after the mythical medieval nobleman who murdered his wives and the village of Gambais near Paris where Landru killed at least seven women between December 1915 and January 1919. Landru also killed at least three other women, plus a young man, at a house he rented from December 1914 to August 1915 in the town of Vernouillet, 35 kms northwest of Paris. The true number of Landru's victims, whose remains were never found, was almost certainly higher.

Bluebeard French folktale

"Bluebeard" is a French folktale, the most famous surviving version of which was written by Charles Perrault and first published by Barbin in Paris in 1697 in Histoires ou contes du temps passé. The tale tells the story of a wealthy violent man in the habit of murdering his wives and the attempts of one wife to avoid the fate of her predecessors. "The White Dove", "The Robber Bridegroom" and "Fitcher's Bird" are tales similar to "Bluebeard". The notoriety of the tale is such that Merriam-Webster gives the word "Bluebeard" the definition of "a man who marries and kills one wife after another," and the verb "bluebearding" has even appeared as a way to describe the crime of either killing a series of women, or seducing and abandoning a series of women.

This use of "serial" killer to paraphrase Brophy's serial murderer does not appear to have been influential at the time.[ citation needed ]

In his more recent study, Vronsky states that the term serial killing first entered into broader American popular usage when published in The New York Times in the spring of 1981, to describe Atlanta serial killer Wayne Williams. Subsequently, throughout the 1980s, the term was used again in the pages of The New York Times, one of the major national news publication of the United States, on 233 occasions. By the end of the 1990s, the use of the term had escalated to 2,514 instances in the paper. [13]

When defining serial killers, researchers generally use "three or more murders" as the baseline, [1] considering it sufficient to provide a pattern without being overly restrictive. [14] Independent of the number of murders, they need to have been committed at different times, and are usually committed in different places. [15] The lack of a cooling-off period (a significant break between the murders) marks the difference between a spree killer and a serial killer. The category has, however, been found to be of no real value to law enforcement, because of definitional problems relating to the concept of a "cooling-off period". [16] Cases of extended bouts of sequential killings over periods of weeks or months with no apparent "cooling off period" or "return to normality" have caused some experts to suggest a hybrid category of "spree-serial killer". [11]

In 2005, the FBI hosted a multi-disciplinary symposium in San Antonio, Texas, which brought together 135 experts on serial murder from a variety of fields and specialties with the goal of identifying the commonalities of knowledge regarding serial murder. The group also settled on a definition of serial murder which FBI investigators widely accept as their standard: "The unlawful killing of two or more victims by the same offender(s) in separate events." [16] The definition does not consider motivation for killing nor define a cooling-off period.


The 'Nemesis of Neglect': Jack the Ripper depicted as a phantom stalking Whitechapel, and as an embodiment of social neglect, in a Punch cartoon of 1888. Jack-the-Ripper-The-Nemesis-of-Neglect-Punch-London-Charivari-cartoon-poem-1888-09-29.jpg
The 'Nemesis of Neglect': Jack the Ripper depicted as a phantom stalking Whitechapel, and as an embodiment of social neglect, in a Punch cartoon of 1888.

Historical criminologists have suggested that there may have been serial murders throughout history, but specific cases were not adequately recorded. Some sources suggest that legends such as werewolves and vampires were inspired by medieval serial killers. [17] In Africa, there have been periodic outbreaks of murder by Lion and Leopard men . [18]

Liu Pengli of China, nephew of the Han Emperor Jing, was made Prince of Jidong in the sixth year of the middle period of Jing's reign (144 BC). According to the Chinese historian Sima Qian, he would "go out on marauding expeditions with 20 or 30 slaves or with young men who were in hiding from the law, murdering people and seizing their belongings for sheer sport". Although many of his subjects knew about these murders, it was not until the 29th year of his reign that the son of one of his victims finally sent a report to the Emperor. Eventually, it was discovered that he had murdered at least 100 people. The officials of the court requested that Liu Pengli be executed; however, the emperor could not bear to have his own nephew killed, so Liu Pengli was made a commoner and banished. [19]

In the 15th century, one of the wealthiest men in Europe and a former companion-in-arms of Joan of Arc, Gilles de Rais, sexually assaulted and killed peasant children, mainly boys, whom he had abducted from the surrounding villages and had taken to his castle. [20] It is estimated that his victims numbered between 140 and 800. [21] The Hungarian aristocrat Elizabeth Báthory, born into one of the wealthiest families in Transylvania, allegedly tortured and killed as many as 650 girls and young women before her arrest in 1610. [22]

Members of the Thuggee cult in India may have murdered a million people between 1740 and 1840. [23] Thug Behram, a member of the cult, may have murdered as many as 931 victims. [24]

In his 1886 book, Psychopathia Sexualis , psychiatrist Richard von Krafft-Ebing noted a case of a serial murderer in the 1870s, a Frenchman named Eusebius Pieydagnelle who had a sexual obsession with blood and confessed to murdering six people. [25]

The unidentified killer Jack the Ripper, who has been called the first modern serial killer, [26] killed at least five women, and possibly more, in London in 1888. He was the subject of a massive manhunt and investigation by the Metropolitan Police, during which many modern criminal investigation techniques were pioneered. A large team of policemen conducted house-to-house inquiries, forensic material was collected and suspects were identified and traced. [27] Police surgeon Thomas Bond assembled one of the earliest character profiles of the offender. [28]

The Ripper murders also marked an important watershed in the treatment of crime by journalists. [29] While not the first serial killer in history, Jack the Ripper's case was the first to create a worldwide media frenzy. [29] The dramatic murders of financially destitute women in the midst of the wealth of London focused the media's attention on the plight of the urban poor and gained coverage worldwide. Jack the Ripper has also been called the most infamous serial killer of all time, and his legend has spawned hundreds of theories on his real identity and many works of fiction. [30]

H. H. Holmes was one of the first documented modern serial killers in the United States, responsible for the death of at least nine victims in the early 1890s. Here as well, the case gained notoriety and wide publicity through possibly sensationalized accounts in William Randolph Hearst's newspapers. At the same time in France, Joseph Vacher became known as "The French Ripper" after killing and mutilating 11 women and children. He was executed in 1898 after confessing to his crimes. [31] [32]

76% of all known serial killers in the 20th century were from the United States. [33]


Some commonly found characteristics of serial killers include the following:

There are exceptions to these criteria, however. For example, Harold Shipman was a successful professional (a General Practitioner working for the NHS). He was considered a pillar of the local community; he even won a professional award for a children's asthma clinic and was interviewed by Granada Television's World in Action on ITV. [42] Dennis Nilsen was an ex-soldier turned civil servant and trade unionist who had no previous criminal record when arrested. Neither was known to have exhibited many of the tell-tale signs. [43] Vlado Taneski, a crime reporter, was a career journalist who was caught after a series of articles he wrote gave clues that he had murdered people. [44] Russell Williams was a successful and respected career Royal Canadian Air Force Colonel who was convicted of murdering two women, along with fetish burglaries and rapes. [45]

Mug shot of serial killer, cannibal, and necrophile Ottis Toole. Ottis Toole.jpg
Mug shot of serial killer, cannibal, and necrophile Ottis Toole.
German serial killer Fritz Haarmann with police detectives, November 1924 Bundesarchiv Bild 102-00824, Hannover, Prozess gegen Friedrich Haarmann.jpg
German serial killer Fritz Haarmann with police detectives, November 1924


Many serial killers have faced similar problems in their childhood development. Hickey's Trauma Control Model explains how early childhood trauma can set the child up for deviant behavior in adulthood; the child's environment (either their parents or society) is the dominant factor determining whether or not the child's behavior escalates into homicidal activity. [46]

Family, or lack thereof, is the most prominent part of a child's development because it is what the child can identify with on a regular basis. [47] "The serial killer is no different from any other individual who is instigated to seek approval from parents, sexual partners, or others." [48] This need for approval is what influences children to attempt to develop social relationships with their family and peers. "The quality of their attachments to parents and other members of the family is critical to how these children relate to and value other members of society." [49]

Wilson and Seaman (1990) conducted a study on incarcerated serial killers, and what they concluded was the most influential factor that contributed to their homicidal activity. [50] Almost all of the serial killers in the study had experienced some sort of environmental problems during their childhood, such as a broken home caused by divorce, or a lack of a parental figure to discipline the child. Nearly half of the serial killers had experienced some type of physical or sexual abuse, and more of them had experienced emotional neglect. [51] When a parent has a drug or alcohol problem, the attention in the household is on the parents rather than the child. This neglect of the child leads to the lowering of their self-esteem and helps develop a fantasy world in which they are in control. Hickey's Trauma Control Model supports how the neglect from parents can facilitate deviant behavior, especially if the child sees substance abuse in action. [52] This then leads to disposition (the inability to attach), which can further lead to homicidal behavior, unless the child finds a way to develop substantial relationships and fight the label they receive. If a child receives no support from anyone, then he or she is unlikely to recover from the traumatic event in a positive way. As stated by E. E. Maccoby, "the family has continued to be seen as a major—perhaps the major—arena for socialization". [53]

Chromosomal make up

There have been recent studies looking into the possibility that an abnormality with one's chromosomes could be the trigger for serial killers. Two serial killers, Bobby Joe Long and Richard Speck, came to attention for reported chromosomal abnormalities. Long had an extra X chromosome. Speck was erroneously reported to have an extra Y chromosome; in fact, his karyotype was performed twice and was normal each time. Hellen Morrison, an American forensic psychiatrist, said in an interview that while researchers have not identified a specific causal gene, the fact that the majority of serial killers are male leads researchers to believe there is "a change associated with the male chromosome make up." [54]


Children who do not have the power to control the mistreatment they suffer sometimes create a new reality to which they can escape. This new reality becomes their fantasy that they have total control of and becomes part of their daily existence. In this fantasy world, their emotional development is guided and maintained. According to Garrison (1996), "the child becomes sociopathic because the normal development of the concepts of right and wrong and empathy towards others is retarded because the child's emotional and social development occurs within his self-centered fantasies. A person can do no wrong in his own world and the pain of others is of no consequence when the purpose of the fantasy world is to satisfy the needs of one person" (Garrison, 1996). Boundaries between fantasy and reality are lost and fantasies turn to dominance, control, sexual conquest, and violence, eventually leading to murder. Fantasy can lead to the first step in the process of a dissociative state, which, in the words of Stephen Giannangelo, "allows the serial killer to leave the stream of consciousness for what is, to him, a better place". [55]

Criminologist Jose Sanchez reports, "the young criminal you see today is more detached from his victim, more ready to hurt or kill ... The lack of empathy for their victims among young criminals is just one symptom of a problem that afflicts the whole society." [47] Lorenzo Carcaterra, author of Gangster (2001), explains how potential criminals are labeled by society, which can then lead to their offspring also developing in the same way through the cycle of violence. The ability for serial killers to appreciate the mental life of others is severely compromised, presumably leading to their dehumanization of others. This process may be considered an expression of the intersubjectivity associated with a cognitive deficit regarding the capability to make sharp distinctions between other people and inanimate objects. For these individuals, objects can appear to possess animistic or humanistic power while people are perceived as objects. [56] Before he was executed, serial killer Ted Bundy stated media violence and pornography had stimulated and increased his need to commit homicide, although this statement was made during last-ditch efforts to appeal his death sentence. [51] However, correlation is not causation (a disturbed physiological disposition, psychosis, lack of socialization, or aggressiveness may contribute to both fantasy creation and serial killing without fantasy creation generally contributing to serial killing for instance). There are exceptions to the typical fantasy patterns of serial killers, as in the case of Dennis Rader, who was a loving family man and the leader of his church.

Organized, disorganized, and mixed

Ted Bundy in custody, Florida, July 1978 (State Archives of Florida) Ted Bundy headshot.jpg
Ted Bundy in custody, Florida, July 1978 (State Archives of Florida)

The FBI's Crime Classification Manual places serial killers into three categories: organized, disorganized, and mixed (i.e., offenders who exhibit organized and disorganized characteristics). [57] Some killers descend from being organized into disorganized as their killings continue, as in the case of psychological decompensation or overconfidence due to having evaded capture, or vice versa, as when a previously disorganized killer identifies one or more specific aspects of the act of killing as his/her source of gratification and develops a modus operandi structured around those.[ citation needed ]

Organized serial killers often plan their crimes methodically, usually abducting victims, killing them in one place and disposing of them in another. They often lure the victims with ploys appealing to their sense of sympathy. Others specifically target prostitutes, who are likely to go voluntarily with a stranger. These killers maintain a high degree of control over the crime scene and usually have a solid knowledge of forensic science that enables them to cover their tracks, such as burying the body or weighing it down and sinking it in a river. They follow their crimes in the news media carefully and often take pride in their actions, as if it were all a grand project. Often, organized killers have social and other interpersonal skills sufficient to enable them to develop both personal and romantic relationships, friends and lovers and sometimes even attract and maintain a spouse and sustain a family including children. Among serial killers, those of this type are in the event of their capture most likely to be described by acquaintances as kind and unlikely to hurt anyone. Ted Bundy and John Wayne Gacy are examples of organized serial killers. [58] In general, the IQs of organized serial killers tend to be near normal range, with a mean of 94.7. Organized nonsocial offenders tend to be on the higher end of the average, with a mean IQ of 99.2. [59]

Disorganized serial killers are usually far more impulsive, often committing their murders with a random weapon available at the time, and usually do not attempt to hide the body. They are likely to be unemployed, a loner, or both, with very few friends. They often turn out to have a history of mental illness, and their modus operandi (M.O.) or lack thereof is often marked by excessive violence and sometimes necrophilia or sexual violence. [60] Disorganized serial killers have been found to have a slightly lower mean IQ than organized serial killers, at 92.8. [59]

Medical professionals

Some people with a pathological interest in the power of life and death tend to be attracted to medical professions or acquiring such a job. [61] These kinds of killers are sometimes referred to as "angels of death" [62] or angels of mercy. Medical professionals will kill their patients for money, for a sense of sadistic pleasure, for a belief that they are "easing" the patient's pain, or simply "because they can". [63] Perhaps the most prolific of these was the British doctor Harold Shipman. Another such killer was nurse Jane Toppan, who admitted during her murder trial that she was sexually aroused by death. [64] She would administer a drug mixture to patients she chose as her victims, lie in bed with them and hold them close to her body as they died. [64]

Another medical profession serial killer is Genene Jones. It is believed she killed 11 to 46 infants and children while working at Bexar County Medical Center Hospital in San Antonio, Texas. [65] She is currently serving a 99-year sentence for the murder of Chelsea McClellan and the attempted murder of Rolando Santos, [65] and became eligible for parole in 2017 due to a law in Texas at the time of her sentencing to reduce prison overcrowding. [65]

A 21st-century example is Canadian nurse Elizabeth Wettlaufer who murdered elderly patients in the nursing homes where she worked.


Highway prostitute Aileen Wuornos killed seven men in Florida between 1989 and 1990 Wuornos.jpg
Highway prostitute Aileen Wuornos killed seven men in Florida between 1989 and 1990

Female serial killers are rare compared to their male counterparts. [66] [67] Sources suggest that female serial killers represented less than one in every six known serial murderers in the United States between 1800 and 2004 (64 females from a total of 416 known offenders), or that around 15% of U.S. serial killers have been women, with a collective number of victims between 427 and 612. [68] The authors of Lethal Ladies, Amanda L. Farrell, Robert D. Keppel, and Victoria B. Titterington, state that "the Justice Department indicated 36 female serial killers have been active over the course of the last century." [69] According to The Journal of Forensic Psychiatry & Psychology, there is evidence that 16% of all serial killers are women. [70]

Kelleher and Kelleher (1998) created several categories to describe female serial killers. They used the classifications of black widow , angel of death, sexual predator, revenge, profit or crime, team killer, question of sanity, unexplained, and unsolved. In using these categories, they observed that most women fell into the categories of black widow or team killer. [71] Although motivations for female serial killers can include attention seeking, addiction, or the result of psychopathological behavioral factors, [72] female serial killers are commonly categorized as murdering men for material gain, usually being emotionally close to their victims, [66] [67] and generally needing to have a relationship with the victim, [71] hence the traditional cultural image of the "black widow." In describing murderer Stacey Castor, forensic psychiatrist James Knoll offered a psychological perspective on what defines a "black widow" type. In simple terms, he described it as a woman who kills two or more husbands or lovers for material gain. Though Castor was not officially defined as a serial killer, it is likely that she would have killed again. [66]

One "analysis of 86 female serial killers from the United States found that the victims tended to be spouses, children or the elderly". [66] [71] Other studies indicate that since 1975, increasingly strangers are marginally the most preferred victim of female serial killers, [73] or that only 26% of female serial killers kill for material gain only. [74] Sources state that each killer will have her own proclivities, needs and triggers." [66] [75] A review of the published literature on female serial murder stated that "sexual or sadistic motives are believed to be extremely rare in female serial murderers, and psychopathic traits and histories of childhood abuse have been consistently reported in these women." [66] [71] A study by Eric W. Hickey (2010) of 64 female serial killers in the United States indicated that sexual activity was one of several motives in 10% of the cases, enjoyment in 11% and control in 14%, and that 51% of all U.S. female serial killers murdered at least one woman and 31% murdered at least one child. [76] In other cases, women have been involved as an accomplice with a male serial killer as a part of a serial killing team. [66] Wilson & Hilton 1998 , pp. 495–498 [71] A 2015 study published in The Journal of Forensic Psychiatry & Psychology found that the most common motive for female serial killers was for financial gain and almost 40% of them had experienced some sort of mental illness. [77]

Peter Vronsky in Female Serial Killers (2007) maintains that female serial killers today often kill for the same reason males do: as a means of expressing rage and control. He suggests that sometimes the theft of the victims' property by the female "black widow" type serial killer appears to be for material gain, but really is akin to a male serial killer's collecting of totems (souvenirs) from the victim as a way of exerting continued control over the victim and reliving it. [78] By contrast, Hickey states that although popular perception sees "black widow" female serial killers as something of the Victorian past, in his statistical study of female serial killer cases reported in the United States since 1826, approximately 75% occurred since 1950. [79]

The methods that female serial killers use for murder are frequently covert or low-profile, such as murder by poison (the preferred choice for killing). [66] [80] Other methods used by female serial killers include shootings (used by 20%), suffocation (16%), stabbing (11%), and drowning (5%). [72] They commit killings in specific places, such as their home or a health-care facility, or at different locations within the same city or state. [81] A notable exception to the typical characteristics of female serial killers is Aileen Wuornos, [82] who killed outdoors instead of at home, used a gun instead of poison, killed strangers instead of friends or family, and killed for personal gratification. [83] The most prolific female serial killer in all of history is allegedly Elizabeth Báthory. Countess Elizabeth Báthory de Ecsed (Báthory Erzsébet in Hungarian, August 7, 1560 – August 21, 1614) was a countess from the renowned Báthory family. Before her husband's death, Elizabeth took great pleasure in torturing the staff, by jamming pins under the servants fingernails or stripping servants and throwing them into the snow. [84] After her husband's death, she and four collaborators were accused of torturing and killing hundreds of girls and young women, with one witness attributing to them over 600 victims, though the number for which they were convicted was 80. Elizabeth herself was neither tried nor convicted. In 1610, however, she was imprisoned in the Csejte Castle, where she remained bricked in a set of rooms until her death four years later. [85]

A 2010 article by Perri and Lichtenwald addressed some of the misperceptions concerning female criminality. [86] In the article, Perri and Lichtenwald analyze the current research regarding female psychopathy, including case studies of female psychopathic killers featuring Münchausen syndrome by proxy, cesarean section homicide, fraud detection homicide, female kill teams, and a female serial killer. [86]


Juvenile serial killers are rare. There are three main categories that juvenile serial killers can fit into: primary, maturing, and secondary killers. There have been studies done to compare and contrast these three groups and to discover similarities and differences between them. [87] Although these types of serial killers are less common, oftentimes adult serial killers may make their debut at an early age and it can be an opportunity for researchers to study what factors brought about the behavior. Though it is rare, the youngest felon on death row is in fact, a juvenile serial killer named Harvey Miguel Robinson. [88]

Ethnicity and demographics in the United States

The racial demographics regarding serial killers are often subject to debate. In the United States, the majority of reported and investigated serial killers are white males, from a lower-to-middle-class background, usually in their late 20s to early 30s. [7] [16] However, there are African American, Asian, and Hispanic (of any race) serial killers as well, and, according to the FBI, based on percentages of the U.S. population, whites are not more likely than other races to be serial killers. [16] Criminal profiler Pat Brown says serial killers are usually reported as white because serial killers usually target victims of their own race, and argues the media typically focuses on "All-American" white and pretty female victims who were the targets of white male offenders; that crimes among minority offenders in urban communities, where crime rates are higher, are under-investigated; and that minority serial killers likely exist at the same ratios as white serial killers for the population. She believes that the myth that serial killers are always white might have become "truth" in some research fields due to the over-reporting of white serial killers in the media. [89]

According to some sources, the percentage of serial killers who are African American is estimated to be between 13% and 22%. [90] [91] Another study has shown that 16% of serial killers are African American, what author Maurice Godwin describes as a "sizeable portion". [92] A 2014 Radford/FGCU Serial Killer Database annual statistics report indicated that for the decades 1900–2010, the percentage of white serial killers was 52.1% while the percentage of African American serial killers was 40.3%. [59] In a 2005 article Anthony Walsh, professor of criminal justice at Boise State University, argued a review of post-WWII serial killings in America finds that the prevalence of minority serial killers has typically been drastically underestimated in both professional research literature and the mass media. As a paradigmatic case of this media double standard, Walsh cites news reporting on white killer Gary Heidnik and African-American killer Harrison Graham. Both men were residents of Philadelphia, Pennsylvania; both imprisoned, tortured, and killed several women; and both were arrested only months apart in 1987. "Heidnik received widespread national attention, became the subject of books and television shows, and served as a model for the fictitious Buffalo Bill in Silence of the Lambs ", writes Walsh, while "Graham received virtually no media attention outside of Philadelphia, Pennsylvania, despite having been convicted of four more murders than Heidnik". [93]


The motives of serial killers are generally placed into four categories: visionary, mission-oriented, hedonistic, and power or control; however, the motives of any given killer may display considerable overlap among these categories. [94]


Visionary serial killers suffer from psychotic breaks with reality, sometimes believing they are another person or are compelled to murder by entities such as the Devil or God. [95] The two most common subgroups are "demon mandated" and "God mandated". [35]

Herbert Mullin believed the American casualties in the Vietnam War were preventing California from experiencing the Big One. As the war wound down, Mullin claimed his father instructed him via telepathy to raise the number of "human sacrifices to nature" in order to delay a catastrophic earthquake that would plunge California into the ocean. [96] David Berkowitz ("Son of Sam") may also be an example of a visionary serial killer, having claimed a demon transmitted orders through his neighbor's dog and instructed him to commit murder. [97] Berkowitz later described those claims as a hoax, as originally concluded by psychiatrist David Abrahamsen. [98]


Mission-oriented killers typically justify their acts as "ridding the world" of certain types of people perceived as undesirable, such as the homeless, ex-cons, homosexuals, drug users, prostitutes, or people of different ethnicity or religion; however, they are generally not psychotic. [99] Some see themselves as attempting to change society, often to cure a societal ill. [100]


This type of serial killer seeks thrills and derives pleasure from killing, seeing people as expendable means to this goal. Forensic psychologists have identified three subtypes of the hedonistic killer: "lust", "thrill", and "comfort". [101]


Paul Durousseau raped and murdered at least seven young women. Paul Durousseau.jpg
Paul Durousseau raped and murdered at least seven young women.

Sex is the primary motive of lust killers, whether or not the victims are dead, and fantasy plays a large role in their killings. Their sexual gratification depends on the amount of torture and mutilation they perform on their victims. The sexual serial murderer has a psychological need to have absolute control, dominance, and power over their victims, and the infliction of torture, pain, and ultimately death is used in an attempt to fulfill their need. [102] They usually use weapons that require close contact with the victims, such as knives or hands. As lust killers continue with their murders, the time between killings decreases or the required level of stimulation increases, sometimes both. [103]

Kenneth Bianchi, one of the "Hillside Stranglers", murdered women and girls of different ages, races and appearance because his sexual urges required different types of stimulation and increasing intensity. [104] Jeffrey Dahmer searched for his perfect fantasy lover—beautiful, submissive and eternal. As his desire increased, he experimented with drugs, alcohol, and exotic sex. His increasing need for stimulation was demonstrated by the dismemberment of victims, whose heads and genitals he preserved, and by his attempts to create a "living zombie" under his control (by pouring acid into a hole drilled into the victim's skull). [105] Dahmer once said, "Lust played a big part of it. Control and lust. Once it happened the first time, it just seemed like it had control of my life from there on in. The killing was just a means to an end. That was the least satisfactory part. I didn't enjoy doing that. That's why I tried to create living zombies with … acid and the drill." He further elaborated on this, also saying, "I wanted to see if it was possible to make—again, it sounds really gross—uh, zombies, people that would not have a will of their own, but would follow my instructions without resistance. So after that, I started using the drilling technique." [106] He experimented with cannibalism to "ensure his victims would always be a part of him". [107]


The primary motive of a thrill killer is to induce pain or terror in their victims, which provides stimulation and excitement for the killer. They seek the adrenaline rush provided by hunting and killing victims. Thrill killers murder only for the kill; usually the attack is not prolonged, and there is no sexual aspect. Usually the victims are strangers, although the killer may have followed them for a period of time. Thrill killers can abstain from killing for long periods of time and become more successful at killing as they refine their murder methods. Many attempt to commit the perfect crime and believe they will not be caught. [108] Robert Hansen took his victims to a secluded area, where he would let them loose and then hunt and kill them. [109] In one of his letters to San Francisco Bay Area newspapers in San Francisco, California, the Zodiac Killer wrote "[killing] gives me the most thrilling experience it is even better than getting your rocks off with a girl". [110] Coral Watts was described by a surviving victim as "excited and hyper and clappin' and just making noises like he was excited, that this was gonna be fun" during the 1982 attack. [111] Slashing, stabbing, hanging, drowning, asphyxiating, and strangling were among the ways Watts killed. [112]

Comfort (profit)

Material gain and a comfortable lifestyle are the primary motives of comfort killers. Usually, the victims are family members and close acquaintances. After a murder, a comfort killer will usually wait for a period of time before killing again to allow any suspicions by family or authorities to subside. They often use poison, most notably arsenic, to kill their victims. Female serial killers are often comfort killers, although not all comfort killers are female. [113] Dorothea Puente killed her tenants for their Social Security checks and buried them in the backyard of her home. [114] H. H. Holmes killed for insurance and business profits. [115] Professional killers ("hitmen") may also be considered comfort serial killers. [116] Richard Kuklinski charged tens of thousands of dollars for a "hit", earning enough money to support his family in a middle-class lifestyle (Bruno, 1993). [117]

Some, like Puente and Holmes, may be involved in or have previous convictions for theft, fraud, non-payment of debts, embezzlement and other crimes of a similar nature. Dorothea Puente was finally arrested on a parole violation, having been on parole for a previous fraud conviction. [118]

In 2016, the oldest prosecution and conviction of a suspected serial killer (Felix Vail) took place in Louisiana. He was convicted of murder 54 years after his wife's death in 1962, which had originally been ruled an accidental drowning, and which occurred only months after Vail took out two life insurance policies on her. [119] He is a suspect in the disappearances of two other women – his girlfriend in 1973 and his second wife in 1984. [120] The prosecutors were allowed to present evidence of the two disappearances under the Doctrine of chances. [121]


A policeman discovering the body of prostitute Catherine Eddowes, one of Jack the Ripper's victims Illustrated Police News - Jack the Ripper 2.png
A policeman discovering the body of prostitute Catherine Eddowes, one of Jack the Ripper's victims

The main objective for this type of serial killer is to gain and exert power over their victim. Such killers are sometimes abused as children, leaving them with feelings of powerlessness and inadequacy as adults. Many power- or control-motivated killers sexually abuse their victims, but they differ from hedonistic killers in that rape is not motivated by lust (as it would be with a lust murder) but as simply another form of dominating the victim. [122] Ted Bundy is an example of a power/control-oriented serial killer. He traveled around the United States seeking women to control. [123]

Media influences

Many serial killers claim that a violent culture influenced them to commit murders. During his final interview, Ted Bundy stated that hardcore pornography was responsible for his actions. Others idolise figures for their deeds or perceived vigilante justice, such as Peter Kürten, who idolized Jack the Ripper, or John Wayne Gacy and Ed Kemper, who both idolized the actor John Wayne. [7]

Killers who have a strong desire for fame or to be renowned for their actions desire media attention as a way of validating and spreading their crimes; fear is also a component here, as some serial killers enjoy causing fear. An example is Dennis Rader, who sought attention from the press during his murder spree. [124]

Many movies, books, and documentaries have been created, detailing serial killers' lives and crimes. For example, the biographical movie Bundy (2002) focuses on serial killer Ted Bundy's personal life in college, leading up to his execution, and Dahmer (2002) tells the story of Jeffrey Dahmer.

Serial killers are also portrayed in fictional media, oftentimes as having substantial intelligence and looking for difficult targets, despite the contradiction with the psychological profile of serial killers. [125]


Biological and sociological

Theories for why certain people commit serial murder have been advanced. Some theorists believe the reasons are biological, suggesting serial killers are born, not made, and that their violent behavior is a result of abnormal brain activity. Holmes and Holmes believe that "until a reliable sample can be obtained and tested, there is no scientific statement that can be made concerning the exact role of biology as a determining factor of a serial killer personality." [126] The "Fractured Identity Syndrome" (FIS) is a merging of Charles Cooley's "looking glass self" and Erving Goffman's "virtual" and "actual social identity" theories. The FIS suggests a social event, or series of events, during one's childhood or adolescence results in a fracturing of the personality of the serial killer. The term "fracture" is defined as a small breakage of the personality which is often not visible to the outside world and is only felt by the killer. [127]

"Social Process Theory" has also been suggested as an explanation for serial murder. Social process theory states that offenders may turn to crime due to peer pressure, family, and friends. Criminal behavior is a process of interaction with social institutions, in which everyone has the potential for criminal behavior. [128] A lack of family structure and identity could also be a cause leading to serial murder traits. A child used as a scapegoat will be deprived of their capacity to feel guilt. Displaced anger could result in animal torture, as identified in the Macdonald triad, and a further lack of basic identity. [129]


A dishonorably discharged Marine, Charles Ng participated in the kidnapping, sadistic torture, rape and murder of numerous victims Charles Ng.jpg
A dishonorably discharged Marine, Charles Ng participated in the kidnapping, sadistic torture, rape and murder of numerous victims

The "military theory" has been proposed as an explanation for why serial murderers kill, as some serial murderers have served in the military or related fields. According to Castle and Hensley, 7% of the serial killers studied had military experience. [130] This figure may be a proportional under-representation when compared to the number of military veterans in a nation's total population. For example, according to the United States census for the year 2000, military veterans comprised 12.7% of the U.S. population; [131] in England, it was estimated in 2007 that military veterans comprised 9.1% of the population. [132] Though by contrast, about 2.5% of the population of Canada in 2006 consisted of military veterans. [133] [134]

There are two theories that can be used to study the correlation between serial killing and military training: Applied learning theory states that serial killing can be learned. The military is training for higher kill rates from servicemen while training the soldiers to be desensitized to taking a human life. [135] Social learning theory can be used when soldiers get praised and accommodated for killing. They learn, or believe that they learn, that it is acceptable to kill because they were praised for it in the military. Serial killers want accreditation for the work that they have done. [136]

In both military and serial killing, the offender or the soldier may become desensitized to killing as well as compartmentalized; the soldiers do not see enemy personnel as "human" and neither do serial killers see their victims as humans. [137] The theories do not imply that military institutions make a deliberate effort to produce serial killers; to the contrary, all military personnel are trained to recognize when, where, and against whom it is appropriate to use deadly force, which starts with the basic Law of Land Warfare , taught during the initial training phase, and may include more stringent policies for military personnel in law enforcement or security. [138] They are also taught ethics in basic training.


FBI: Issues and practices

In 2008, the Federal Bureau of Investigation (FBI) published a handbook titled Serial Murder which was the product of a symposium held in 2005 to bring together the many issues surrounding serial murder, including its investigation. [139]


Angel Maturino Resendiz, who was a FBI Ten Most Wanted Fugitive Angel Maturino Resendiz.jpg
Ángel Maturino Reséndiz, who was a FBI Ten Most Wanted Fugitive

According to the FBI, identifying one, or multiple, murders as being the work of a serial killer is the first challenge an investigation faces, especially if the victim(s) come from a marginalized or high risk population and is normally linked through forensic or behavioral evidence (FBI 2008). [139] Should the cases cross multiple jurisdictions, the law enforcement system in the United States is fragmented and thus not configured to detect multiple similar murders across a large geographic area (Egger 1998). [140] The FBI suggests utilizing databases and increasing interdepartmental communication. Keppel (1989) [141] suggests holding multi-jurisdictional conferences regularly to compare cases giving departments a greater chance to detect linked cases and overcome linkage blindness. One such collaboration, the Radford/FGCU Serial Killer Database Project [142] was proposed at the 2012 FDIAI Annual Conference. [143] Utilizing Radford's Serial Killer Database as a starting point, the new collaboration, [144] hosted by FGCU Justice Studies, has invited and is working in conjunction with other Universities to maintain and expand the scope of the database to also include spree and mass murders. Utilizing over 170 data points, multiple-murderer methodology and victimology; researchers and Law Enforcement Agencies can build case studies and statistical profiles to further research the Who, What, Why and How of these types of crimes.


Leadership, or administration, should play a small or virtually non-existent role in the actual investigation past assigning knowledgeable or experienced homicide investigators to lead positions. The administration's role is not to run the investigation but to establish and reaffirm the primary goal of catching the serial killer, as well as provide support for the investigators. The FBI (2008) suggests completing Memorandums of Understanding to facilitate support and commitment of resources from different jurisdictions to an investigation. [139] Egger (1998) takes this one step further and suggests completing mutual aid pacts, which are written agreements to provide support to each other in a time of need, with surrounding jurisdictions. Doing this in advance would save time and resources that could be used on the investigation. [140]


Organization of the structure of an investigation is key to its success, as demonstrated by the investigation of Gary Ridgway, the Green River Killer. Once a serial murder case was established, a task force was created to track down and arrest the offender. Over the course of the investigation, for various reasons, the task force's organization was radically changed and reorganized multiple times – at one point including more than 50 full-time personnel, and at another, only a single investigator. Eventually, what led to the end of the investigation was a conference of 25 detectives organized to share ideas to solve the case. [145]

The FBI handbook provides a description of how a task force should be organized but offers no additional options on how to structure the investigation. While it appears advantageous to have a full-time staff assigned to a serial murder investigation, it can become prohibitively expensive. For example, the Green River Task Force cost upwards of $2 million per year, [145] and as was witnessed with the Green River Killer investigation, other strategies can prevail where a task force fails.

Albert De Salvo, who claimed to be the "Boston Strangler", after being caught in Lynn, Massachusetts in 1967. Albert deSalvo.jpg
Albert De Salvo, who claimed to be the "Boston Strangler", after being caught in Lynn, Massachusetts in 1967.

A common strategy, already employed by many departments for other reasons, is the conference, in which departments get together and focus on a specific set of topics. [146] With serial murders, the focus is typically on unsolved cases, with evidence thought to be related to the case at hand.

Similar to a conference is an information clearing-house in which a jurisdiction with a suspected serial murder case collects all of its evidence and actively seeks data which may be related from other jurisdictions. [146] By collecting all of the related information into one place, they provide a central point in which it can be organized and easily accessed by other jurisdictions working toward the goal of arresting an offender and ending the murders.

Already mentioned was the task force, [146] FBI 2008, [139] Keppel 1989 [141] which provides for a flexible, organized, framework for jurisdictions depending on the needs of the investigation. Unfortunately due to the need to commit resources (manpower, money, equipment, etc.) for long periods of time it can be an unsustainable option.

In the case of the investigation of Aileen Wournos, the Marion County Sheriff coordinated multiple agencies without any written or formal agreement. [140] While not a specific strategy for a serial murder investigation, this is certainly a best practice in so far as the agencies were able to work easily together toward a common goal.

Finally, once a serial murder investigation has been identified, utilization of an FBI Rapid Response Team can assist both experienced and inexperienced jurisdictions in setting up a task force. This is completed by organizing and delegating jobs, by compiling and analyzing clues, and by establishing communication between the parties involved. [140]

Resource augmentation

During the course of a serial murder investigation it may become necessary to call in additional resources; the FBI defines this as Resource Augmentation. Within the structure of a task force the addition of a resource should be thought of as either long term, or short term. If the task force's framework is expanded to include the new resource, then it should be permanent and not removed. For short term needs, such as setting up road blocks or canvassing a neighborhood, additional resources should be called in on a short term basis. The decision of whether resources are needed short or long term should be left to the lead investigator and facilitated by the administration (FBI 2008). [139] The confusion and counter productiveness created by changing the structure of a task force mid investigation is illustrated by the way the Green River Task Force's staffing and structure was changed multiple times throughout the investigation. This made an already complicated situation more difficult, resulting in the delay or loss of information, which allowed Ridgeway to continue killing (Guillen 2007). [145] The FBI model does not take into account that permanently expanding a task force, or investigative structure, may not be possible due to cost or personnel availability. Egger (1998) offers several alternative strategies including; using investigative consultants, or experienced staff to augment an investigative team. Not all departments have investigators experienced in serial murder and by temporarily bringing in consultants, they can educate a department to a level of competence then step out. This would reduce the initially established framework of the investigation team and save the department the cost of retaining the consultants until the conclusion of the investigation. [140]


The FBI handbook (2008) [139] and Keppel (1989) [141] both stress communication as paramount. The difference is that the FBI handbook (2008) [139] concentrates primarily on communication within a task force while Keppel (1989) [141] makes getting information out to, and allowing information to be passed back from patrol officers a priority. The FBI handbook (2008) [139] suggest having daily e-mail or in person briefings for all staff involved in the investigation and providing periodic summary briefings to patrol officer and managers. Looking back on a majority of serial murderer arrests, most are exercised by patrol officers in the course of their every day duties and unrelated to the ongoing serial murder investigation (Egger 1998, [140] Keppel 1989). [141] Keppel (1989) [141] provides examples of Larry Eyler, who was arrested during a traffic stop for a parking violation, and Ted Bundy, who was arrested during a traffic stop for operating a stolen vehicle. In each case it was uniformed officers, not directly involved in the investigation, who knew what to look for and took the direct action that stopped the killer. By providing up to date (as opposed to periodic) briefings and information to officers on the street the chances of catching a serial killer, or finding solid leads, are increased.

Data management

A serial murder investigation generates staggering amounts of data, all of which needs to be reviewed and analyzed. A standardized method of documenting and distributing information must be established and investigators must be allowed time to complete reports while investigating leads and at the end of a shift (FBI 2008). [139] When the mechanism for data management is insufficient, leads are not only lost or buried but the investigation can be hindered and new information can become difficult to obtain or become corrupted. During the Green River Killer investigation, reporters would often find and interview possible victims or witnesses ahead of investigators. The understaffed investigation was unable to keep up the information flow, which prevented them from promptly responding to leads. To make matters worse, investigators believed that the journalists, untrained in interviewing victims or witnesses of crimes, would corrupt the information and result in unreliable leads (Guillen 2007). [145]


Notorious and infamous serial killers number in the hundreds, and a subculture revolves around their legacies. That subculture includes the collection, sale, and display of serial killer memorabilia, dubbed "murderabilia" by one of the best-known opponents of collectors of serial killer remnants, Andrew Kahan. He is the director of the Mayor's Crime Victims Office in Houston and is backed by the families of murder victims and "Son of Sam laws" existing in some states that prevent murderers from profiting from the publicity generated by their crimes. [147]

Such memorabilia includes the paintings, writings, and poems of these killers. [148] Recently, marketing has capitalized even more upon interest in serial killers with the rise of various merchandise such as trading cards, action figures, and books such as The Serial Killer Files: The Who, What, Where, How, and Why of the World's Most Terrifying Murderers by Harold Schechter, and The A-Z Encyclopedia of Serial Killers by Schecter and David Everitt. Some serial killers attain celebrity status in the way they acquire fans, and may have previous personal possessions auctioned off on websites like eBay. A few examples of this are Ed Gein's 150-pound stolen gravestone and Bobby Joe Long's sunglasses. [149]

See also


  1. 1 2 3 4 A serial killer is most commonly defined as a person who kills three or more people for psychological gratification; reliable sources over the years agree. See, for example:
    • "Serial killer". . Retrieved June 15, 2016. A person who murders 3+ people over a period of > 30 days, with an inactive period between each murder, and whose motivation for killing is largely based on psychological gratification.
    • Holmes & Holmes 1998 , Serial murder is the killing of three or more people over a period of more than 30 days, with a significant cooling-off period between the murders [...] The baseline number of three victims appears to be most common among those who are the academic authorities in the field. The time frame also appears to be an agreed-upon component of the definition.
    • Petherick 2005 , p. 190 Three killings seem to be required in the most popular operational definition of serial killing since they are enough to provide a pattern within the killings without being overly restrictive.
    • Flowers 2012 , p. 195 in general, most experts on serial murder require that a minimum of three murders be committed at different times and usually different places for a person to qualify as a serial killer.
    • Schechter 2012 , p. 73 Most experts seem to agree, however, that to qualify as a serial killer, an individual has to slay a minimum of three unrelated victims.
  2. Burkhalter Chmelir 2003, p. 1.
  3. 1 2 Hough & McCorkle 2016 , p. 73 Serial killing has been defined by different researchers or groups as either two or more, three or more, or even four or more people killed over at least one month with a cooling off period between each of the murders.
  4. Burkhalter Chmelir 2003 , p. 1, Morton 2005 , pp. 4, 9
  5. Geberth 1995, p. ? "The base population was 387 serial murderers, who killed (under various motivations), three or more persons over a period of time with cooling-off periods between the events. The author identified 232 male serial murderers who violated their victims sexually".
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Further reading

Related Research Articles

A spree killer is someone who kills two or more victims in a short time, in multiple locations. The U.S. Bureau of Justice Statistics defines a spree killing as "killings at two or more locations with almost no time break between murders".

Aileen Wuornos American serial killer

Aileen Carol Wuornos Pralle was an American serial killer who murdered seven men in Florida between 1989 and 1990 by shooting them at point-blank range. Wuornos claimed that her victims had either raped or attempted to rape her while she was working as a prostitute, and that all of the homicides were committed in self-defense. She was convicted and sentenced to death for six of the murders and was executed by lethal injection on October 9, 2002.

Gary Ridgway American serial killer

Gary Leon Ridgway, also known as the Green River Killer, is an American serial killer. He was initially convicted of 48 separate murders. As part of his plea bargain, another conviction was added, bringing the total number of convictions to 49, making him the second most prolific serial killer in United States history according to confirmed murders. He killed a myriad of teenage girls and women in the state of Washington during the 1980s and 1990s.

A lust murder is a homicide in which the offender searches for erotic satisfaction by killing someone. Lust murder is synonymous with the paraphilic term erotophonophilia, which is sexual arousal or gratification contingent on the death of a human being. The phrase "lust killing" stems from the original work of Richard von Krafft-Ebing in his 1898 discussion of sadistic homicides. Commonly, this type of crime is manifested either by murder during sexual activity, by mutilating the sexual organs or areas of the victim's body, or by murder and mutilation. The mutilation of the victim may include evisceration, displacement of the sexual organs, or both. The mutilation usually takes place postmortem. Although the killing sequence may include an act of sexual intercourse, sexual intercourse does not always occur, and other types of sexual acts may be part of the homicide.

Dennis Rader American serial killer

Dennis Lynn Rader is an American serial killer known as BTK or the BTK Strangler. He gave himself the name "BTK". Between 1974 and 1991, Rader killed ten people in the Wichita, Kansas metro area.

Piquerism is a sexual interest in penetrating the skin of another person with sharp objects. Sometimes, this is serious enough to cause extreme injuries or even death. Piquerism is a paraphilia as well as a form of sadism. The most frequently targeted areas of the body are the breasts, buttocks, or groin.

Offender profiling, also known as criminal profiling, is an investigative strategy used by law enforcement agencies to identify likely suspects and has been used by investigators to link cases that may have been committed by the same perpetrator. Multiple crimes may be linked to a specific offender and the profile may be used to predict the identified offender's future actions. In the 1980s, most researchers believed offender profiling was relevant only to sex crimes, like serial rape or sexual homicide, but since the late 1990s research has been published to support its application to arson (1998), and then later terrorism (2000) and burglary (2002)..

John Edward Douglas is a retired special agent and unit chief in the United States Federal Bureau of Investigation (FBI). He was one of the first criminal profilers and has written books on criminal psychology.

FBI method of profiling

The FBI method of profiling is a system created by the Federal Bureau of Investigation (FBI) used to detect and classify the major personality and behavioral characteristics of an individual based upon analysis of the crime or crimes the person committed. One of the first American profilers was FBI agent John E. Douglas, who was also instrumental in developing the behavioral science method of law enforcement.

An angel of mercy or angel of death is a rare type of criminal offender who is usually employed as a caregiver and intentionally harms or kills people under their care. The angel of mercy is often in a position of power and may decide the victim would be better off if they no longer suffered from whatever severe illness is plaguing them. This person then uses their knowledge to kill the victim. In some cases, as time goes on, this behavior escalates to encompass the healthy and the easily treated.

David G. Meirhofer was an American serial killer who committed four murders in rural Montana between 1967 and 1974 — three of them children.

The Macdonald triad is a set of three factors that has been suggested if all three or any combination of two, are present together, to be predictive of or associated with later violent tendencies, particularly with relation to serial offenses. The triad was first proposed by psychiatrist J.M. Macdonald in "The Threat to Kill", a 1963 paper in the American Journal of Psychiatry. Small-scale studies conducted by psychiatrists Daniel Hellman and Nathan Blackman, and then FBI agents John E. Douglas and Robert K. Ressler along with Dr. Ann Burgess, claimed substantial evidence for the association of these childhood patterns with later predatory behavior. Although it remains an influential and widely taught theory, subsequent research has generally not validated this line of thinking.

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David Owen Brooks is an accomplice of American serial killer Dean Corll who, along with Elmer Wayne Henley, Jr., abducted, raped, tortured, and murdered at least 28 boys and young men, in a series of killings spanning from 1970 to 1973 in Houston, Texas. The crimes, which became known as the Houston Mass Murders, came to light after Henley fatally shot Corll.

The classification of murder has been described by various experts including law enforcement personnel, criminologists, and psychologists. Lust serial murder is the act of deviant behaviors by the means of brutally and sadistically killing multiple victims to achieve ultimate sexual satisfaction with cooling off periods. The most common motives within the lust crimes are the gaining of pleasure, control, and satisfaction toward hostile fantasies through the resulting of crimes. Lust murderers are likely to repeat the crimes over a long period of time with increase of aggressive paraphilia process. The paraphilia within the lust murders usually involve mutilation, flagellation, picquerism, cannibalism, vampirism, and necrophilia with victim bodies. Defined by the FBI, lust serial murderers premeditate each of their sexual offenses, both the nature and content of the killing consistent with their sexual fantasy. Lust murderer cannot escape from his own fantasy, and over time the imagines grow increasingly violent and deadly and escalate the lust offender's attack. The result of the attack satisfies the offender's sexual lust including power, domination, molestation, and degradation or humiliation of others. The creation of the fantasy and fascination with paraphilia is rooted in the lust murderer's childhood development. They were exposed to traumatic events; such as being sexually abuse or violently abuse by caregivers or other adults. Those individuals who cannot cope with past trauma will likely foster feelings of self-doubt, hopelessness, and helplessness. The lack of self-esteem leads the individual to isolate themselves from society and lack the ability to form attachment with others. From this stage, the individual will begin daydreaming and fantasy becomes a stand-in for the social relationships that maladjusted individual is incapable of forming. Fantasy then become a safe place for that individual to fall into once encounter similar trauma events in the past experiences. Sexual fantasy active paraphilia system and eventually become process in and of itself. Most sexual lust offenders sustain their paraphilia process through fantasy, compulsive masturbation, and facilitators. Lust murderers increase the use of drug, alcohol, and pornography can escalate their paraphilic that eventually engaging in sexual homicide or lust murder.

Necrophilia is a pathological fascination with dead bodies, which often takes the form of a desire to engage with them in sexual activities, such as intercourse. Although prohibited by the laws of many countries, there have been many reported cases of necrophilia throughout history.

<i>Female Serial Killers: How and Why Women Become Monsters</i> book by Peter Vronsky

Female Serial Killers: How and Why Women Become Monsters is a non-fiction true crime history by Peter Vronsky, a criminal justice historian. It surveys the history of female serial killers and female-perpetrated serial homicide and its culture, psychopathology, and investigation from the Roman Empire to the mid 2000s.