John Wayne Gacy
Gacy became known as "Pogo the Clown" and the "Killer Clown" because he would dress as a clown for fundraising events and parades. In March 1980, Gacy was convicted of 33 murders, as well as sex crimes, committed between 1972 and 1978, and given the death penalty. He was executed by lethal injection on May 10, 1994. Gacy's execution was filmed; his last words were, "kiss my ass". There were problems with the execution, but it eventually ended in Gacy's death. Immediately prior to his execution, Gacy observed the Last Rites with a Catholic priest; he had converted to the Catholic Church.