Miller did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[4] He was released by the Diamondbacks organization on May 28,2020.[5]
Southern Illinois Miners
On January 19,2021,Miller signed with the Southern Illinois Miners of the Frontier League.[6] In 25 appearances for Southern Illinois,he compiled a 2.89 ERA with 38 strikeouts and 6 saves across 38 innings pitched.[7] Miller became a free agent on October 6,when the Miners folded.[8]
On May 19, 2022, Miller's contract was purchased by the New York Yankees organization.[11] In 25 appearances for the High–A Hudson Valley Renegades, Miller posted a 2–3 record and 5.75 ERA with 50 strikeouts across 36 innings.[12]
Boston Red Sox
On December 7, 2022, Miller was selected by the Boston Red Sox in the minor league phase of the Rule 5 draft.[13] Miller made 41 appearances for the Double–A Portland Sea Dogs, working to a 5–3 record and 4.03 ERA with 67 strikeouts across 60+1⁄3 innings pitched.[14]
Los Angeles Angels
On December 6, 2023, the Los Angeles Angels selected Ryan Miller in the minor league phase of the Rule 5 draft.[15] He made 34 appearances for the Triple–A Salt Lake Bees in 2024, posting a 5–1 record and 2.45 ERA with 61 strikeouts over 62+1⁄3 innings of work. On August 27, 2024, Miller was selected to the 40-man roster and promoted to the major leagues for the first time.[16] He made his MLB debut that day against the Detroit Tigers, tossing a scoreless inning of relief.[17] He became the fifth Sioux Falls Canaries alumnus to debut in MLB; ironically, the only player of those 5 still active at the time (that being John Brebbia) was designated for assignment the same day. In 13 games during his rookie campaign, Miller logged a 4.15 ERA with 11 strikeouts over 13 innings pitched. He was designated for assignment on November 7, to create room on the 40-man roster for Kyle Hendricks.[18] Miller was released by the team on November 12.[19]
Detroit Tigers
On December 12, 2024, Miller signed a minor league contract with the Detroit Tigers.[20][21] He made 37 appearances for the Triple-A Toledo Mud Hens, posting a 2-1 record and 4.32 ERA with 44 strikeouts and two saves across 50 innings pitched. On August 4, 2025, Miller was released by the Tigers organization.[22]
Colorado Rockies
On January 9, 2026, Miller signed a minor league contract with the Colorado Rockies.[23]
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