Name	Known for
John Wayne Gacy Self - Serial Killer (archive footage) Self - Serial Killer (archive footage) See fewer	The New Detectives: Case Studies in Forensic Science (1996)
Craig Bowley Self - John Wayne Gacy Prison Correspondent Self - John Wayne Gacy Prison Correspondent See fewer	John Wayne Gacy: Devil in Disguise (2021)
Jay Levine Self - Ret. News Anchor & Chief Correspondent Self - Ret. News Anchor & Chief Correspondent See fewer	The Fugitive (1993)
Joseph Kozenczak Self - Fmr. Des Plaines Police Chief Self - Fmr. Des Plaines Police Chief See fewer	Psychic Investigators (2006)
Dave Hachmeister Self - Ret. Des Plaines Police Officer Self - Ret. Des Plaines Police Officer See fewer	John Wayne Gacy: Killer Clown's Revenge (2019)
Anthony Antonucci Self - Former John Wayne Gacy Employee Self - Former John Wayne Gacy Employee See fewer	Surviving a Serial Killer (2021)
Rafael Tovar Self - Ret. Des Plaines Police Detective Self - Ret. Des Plaines Police Detective See fewer	John Wayne Gacy: Devil in Disguise (2021)
Lawrence Finder Self - Fmr. Prosecutor, Cook County, IL Self - Fmr. Prosecutor, Cook County, IL See fewer	John Wayne Gacy: Devil in Disguise (2021)
Terry Sullivan Self - Fmr. Prosecutor, Cook County, IL Self - Fmr. Prosecutor, Cook County, IL See fewer	Serious Serial Killers (2012)
Mike Albrecht Self - Ret. Des Plaines Police Officer (as Michael Albrecht) Self - Ret. Des Plaines Police Officer (as Michael Albrecht) See fewer	John Wayne Gacy: Devil in Disguise (2021)
Kim Byers-Lund Self - Co-Worker of Robert Piest (archive footage) (as Kim Byers) Self - Co-Worker of Robert Piest (archive footage) (as Kim Byers) See fewer	Conversations with a Killer: The John Wayne Gacy Tapes (2022)
Rosalynn Carter Self - Former First Lady (archive footage) Self - Former First Lady (archive footage) See fewer	Americans (1978)
John Chancellor Self - Anchor, NBC Nightly News (archive footage) Self - Anchor, NBC Nightly News (archive footage) See fewer	Baseball (1994)
David Cram Self - Former John Wayne Gacy Employee (archive footage) Self - Former John Wayne Gacy Employee (archive footage) See fewer	Serious Serial Killers (2012)
Philip Hersh Audio Description Narrator (voice) Audio Description Narrator (voice) See fewer	District 13: Ultimatum (2009)
Harold Piest Jr. Self - Father of Robert Piest (archive footage) Self - Father of Robert Piest (archive footage) See fewer
Elizabeth Piest Self - Mother of Robert Piest (archive footage) Self - Mother of Robert Piest (archive footage) See fewer
Robert Piest Self - Victim of John Wayne Gacy (archive footage) Self - Victim of John Wayne Gacy (archive footage) See fewer
Robert K. Ressler Self - Ret. FBI Profiler (archive footage) Self - Ret. FBI Profiler (archive footage) See fewer	Murder: No Apparent Motive (1984)
Michael Rossi Self - Former John Wayne Gacy Employee (archive footage) Self - Former John Wayne Gacy Employee (archive footage) See fewer
John Szyc Self - Victim of John Wayne Gacy (archive footage) Self - Victim of John Wayne Gacy (archive footage) See fewer