Info John Wayne Gacy In 1979, John Wayne Gacy (1942-1994) was arrested in Cook County, Illinois for a series of murders in the area of Des Moines, Illinois. The FBI provided investigative assistance to Illinois police. In 1980, Gacy was convicted of murdering 33 young men ranging in age from 14 to 21. John Wayne Gacy Part 01 of 01 View