He Drugged, Tortured, Raped and then Killed

According to the book Killer Clown: The John Wayne Gacy Murders by Sullivan and Maiken, Gacy said that, "his first killing took place in January, 1972, and the second in January, 1974, about a year and a half after his marriage." He further confessed that he would lure his victims into being handcuffed and then he would sexually assault them. To muffle the screams of his victims, he would stuff a sock or underwear into their mouths and kill them by pulling a rope or board against their throats, as he raped them. Gacy admitted to sometimes keeping the dead bodies under his bed or in the attic for several hours before eventually burying them in the crawl space.

http://www.crimelibrary.com/serial_killers/notorious/gacy/count_6.html