John Wayne Gacy
In October 2011, Cook County Sheriff Thomas Dart announced that investigators, having obtained full DNA profiles from each of the unidentified victims, were to renew their efforts to identify all of them. At a press conference held to announce this intention, Sheriff Dart stated investigators are actively seeking DNA samples from individuals across the United States related to any male missing between 1970 and 1979. Test results thus far conducted have confirmed the identification of three victims, ruled out the possibility of numerous other missing youths as being victims of Gacy, and solved four unrelated cold cases dating between 1972 and 1979.