The Gruesome Crimes of John Wayne Gacy 17 September 2023 serialkilz.com True Crime 0 Fingerprints from deceased victims are part of evidence from the 1980 murder trial of serial killer John Wayne Gacy, stored at the Cook County Clerk of the Circuit Court Records Storage and Digital Imaging Center Tuesday, Dec. 11, 2018, in Cicero, Ill. Gacy sexually assaulted, tortured and murdered at least 33 teenage boys and young men in Cook County between 1972 and 1978 and spent 14 years on death row before he was executed by lethal injection at Stateville Correctional Center in 1994. (Erin Hooley/Chicago Tribune)