Eric Till Director Brian Dennehy John Wayne Gacy Actor Michael Riley Lieutenant Joseph 'Joe', 'Polock' Kozenczak Actor Margot Kidder Rachel Grayson Actor Meg Foster City Attorney Linda Carlson Actor Scott Hylands Delta Squad Sergeant Mike Paxton Actor David Eisner Detective Terry Williams Actor John Boylan Detective Gary Atkins Actor Tony De Santis Delta Squad Detective Craig DeMarco Actor Mark Humphrey Delta Squad Detective King Actor Gary Reineke Delta Squad Detective Leonard "Lenny" Petrie Actor Tim Progosh Delta Squad Detective Jack Morris Actor Danny Pawlick Patrolman Tony Santori Actor Bruce Ramsay Forensic Officer Edward "Ed" Bragg Actor Brenda Bazinet Alice Pearson Actor Liliane Clune Marcia Kozenczak Actor Toby Proctor Michael Kozenczak Actor Christopher Marren Billy Actor Gerry Quigley Detective William "Bill" Walden Actor Nicholas Pasco Detective Gil Barton Actor Michael Copeman Police Chief Wallace "Wally" Cameron Actor James Kee A.D.A. Don Hoskins Actor