Randall Greenawalt (February 24, 1949 – January 23, 1997) was an American serial killer and mass murderer. Originally sentenced to life imprisonment for two murders committed in 1974, Greenawalt later became notorious for escaping together with fellow murderer Gary Tison and his three sons from prison, embarking on a two-week killing spree through Arizona and Colorado that left six people dead in 1978. He was promptly sentenced to death and thereafter executed in 1997, with his case serving as the basis for the Supreme Court decision Tison v. Arizona.