American Serial Killer - John Wayne Gacy (1942-1994) Original Crime Scene Trial Photographs – Trial exhibit photograph, stamped with an embossed Cook County Sheriff seal to the corners, pen to the reverse, obtained from the legal counsel, depicts human remains found beneath the crawl space, together with the crawl space entrance, all in very good condition (6) Note: John Wayne Gacy was an American serial killer who sexually assaulted, tortured and murdered at least 33 teenaged boys and young men between 1972 and 1978.