In non-consequentialist ethical thought, there is a moral distinction between killing and letting die. Whereas killing involves intervention, letting die involves withholding care (for example, in passive euthanasia), [1] [2] or other forms of inaction (such as in the Trolley problem).
Also in medical ethics there is a moral distinction between euthanasia and letting die. Legally, patients often have a right to reject life-sustaining care, in areas that do not permit euthanasia. [3]