John Wayne Gacy was convicted of murdering 33 young men and boys between 1972 and 1978. Most of the bodies were found buried underneath the crawl space of his Chicago-area home. At the time of his arrest, Gacy claimed he was responsible for at least 45 murders. Gacy was given the nickname "The Killer Clown," because he sometimes adopted the persona of "Pogo the Clown" and participated in charity fundraising events. He was ultimately sentenced to death and executed at the Stateville Correctional Center in 1994 by lethal injection. His notorious last words: "Kiss my ass."