In this undated file photo provided by the Cook County Sheriff's Office, authorities exhume a box with the remains of unidentified victims of serial killer John Wayne Gacy, who was convicted of killing 33 young men and boys in the Chicago area in the 1970s. (AP Photo/Cook County Sheriff's Office, File)

Francis Wayne Alexander would have been 21 or 22 years old when Gacy killed him sometime between early 1976 and early 1977, Cook County Sheriff Tom Dart said at a news conference in announcing the identification of Alexander’s remains.

John Wayne Gacy

John Wayne Gacy

John Wayne Gacy's lawyer has written a book about defending the notorious killer. We hear his personal tales about Gacy and the highly publicized trial.