William George Bonin (January 8, 1947 – February 23, 1996), also known as the Freeway Killer, was an American serial killer and twice-paroled sex offender who committed the rape, torture, and murder of a minimum of 21 boys and young men in a series of killings in 1979 and 1980 in southern California. Bonin is also suspected of committing a further 15 murders. Described by the prosecutor at his first trial as "the most arch-evil person who ever existed", Bonin was convicted of 14 of the murders linked to the "Freeway Killer" in two separate trials in 1982 and 1983. He spent 14 years on death row before he was executed by lethal injection at San Quentin State Prison in 1996.