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William George Bonin (January 8, 1947 – February 23, 1996), also called the Freeway Killer and the Freeway Strangler, was an American serial killer and twice paroled sex offender, who raped, tortured, and murdered at least twenty-one young men and boys between May 1979 and June 1980. On at least twelve occasions, Bonin was helped by one of his four known accomplices; he is also suspected of committing fifteen other murders. Bonin became known as the "Freeway Killer" because most of his victims' bodies were discovered beside freeways in southern California.
Described by the prosecutor at his first trial as "the most arch-evil person who ever existed", Bonin was convicted of fourteen of the murders linked to the "Freeway Killer" in two trials, in 1982 and 1983. He spent fourteen years on death row before his execution by lethal injection at San Quentin State Prison in 1996. Bonin was the first prisoner in California to die by this method.