Name	Known for
William Kunkle Self - Assistant District Attorney, Cook County (as William J. Kunkle Jr.) Self - Assistant District Attorney, Cook County (as William J. Kunkle Jr.) See fewer	The John Wayne Gacy Murders: Life and Death in Chicago (2024)
Rachael Bell Self - True Crime Author Self - True Crime Author See fewer	Behind the Yellow Tape (2010)
Pat Berry Self - Will County Sherrif's Office (as Det. Pat Berry) Self - Will County Sherrif's Office (as Det. Pat Berry) See fewer	The Mark of a Killer (2019)
Greg Bedoe Self - Investigator, State Attorney's Office Self - Investigator, State Attorney's Office See fewer	Invisible Monsters: Serial Killers in America (2021)
Mike Albrecht Self - Des Plaines Police Department (as Det. Mike Albrecht) Self - Des Plaines Police Department (as Det. Mike Albrecht) See fewer	John Wayne Gacy: Devil in Disguise (2021)
Mark E. Safarik Self - FBI Criminal Profiler (as Mark Safarik) Self - FBI Criminal Profiler (as Mark Safarik) See fewer	Dreaming Darkly
Lawrence Finder Self - Assistant State's Attorney, Cook County (as Lawrence D. Finder) Self - Assistant State's Attorney, Cook County (as Lawrence D. Finder) See fewer	John Wayne Gacy: Devil in Disguise (2021)
Kim Byers-Lund Self - Robert Piest's Friend Self - Robert Piest's Friend See fewer	Conversations with a Killer: The John Wayne Gacy Tapes (2022)
Barry Boschelli Self - John Wayne Gacy's Childhood Friend Self - John Wayne Gacy's Childhood Friend See fewer	Serious Serial Killers (2012)
John Butkovich Self - Victim (archive footage) Self - Victim (archive footage) See fewer
Rosalynn Carter Self - First Lady of the United States (archive footage) Self - First Lady of the United States (archive footage) See fewer	Americans (1978)
John Wayne Gacy Self - Serial Killer (archive footage) Self - Serial Killer (archive footage) See fewer	The New Detectives: Case Studies in Forensic Science (1996)
Sam Giancana Self - Chicago Mob Boss (archive footage) Self - Chicago Mob Boss (archive footage) See fewer	Peep Show (1965)
Gregory Godzik Self - Victim (archive footage) Self - Victim (archive footage) See fewer
Frank Landingin Self - Victim (archive footage) Self - Victim (archive footage) See fewer
James Mazzara Self - Victim (archive footage) Self - Victim (archive footage) See fewer
Timothy O'Rourke Self - Victim (archive footage) Self - Victim (archive footage) See fewer
Robert Piest Self - Victim (archive footage) Self - Victim (archive footage) See fewer
Alicia Alvis Coroner (uncredited) Coroner (uncredited) See fewer	Nothing is Impossible (2022)
Felicia Andes Lady on Security Camera (uncredited) Lady on Security Camera (uncredited) See fewer	Murder Calls (2017)
Mack Bayda Timothy O'Rourke (uncredited) Timothy O'Rourke (uncredited) See fewer	A Man Called Otto (2022)
Robert Blackburn Desk Sergeant (uncredited) Desk Sergeant (uncredited) See fewer	Snapped (2004)
Michael Cutali John Wayne Gacy's Father (uncredited) John Wayne Gacy's Father (uncredited) See fewer	Grounded (X)
Al Dooby John Wayne Gacy (uncredited) John Wayne Gacy (uncredited) See fewer	The Redeemables (2022)
Gavin Hensley Street Teen #1 (uncredited) Street Teen #1 (uncredited) See fewer	Holland (2025)
Keegan Leiba Plain Clothes Detective #1 (uncredited) Plain Clothes Detective #1 (uncredited) See fewer	The Boss Ladies Hot Wild Kiss of Death Retreat
Sean Riehm John Wayne Gacy Victim (uncredited) John Wayne Gacy Victim (uncredited) See fewer	Ryn (2021)
Bethany Stahl Police Dispatch (uncredited) Police Dispatch (uncredited) See fewer	Save the Arctic (2019)
James Stokes Detective Greg Bedoe (uncredited) Detective Greg Bedoe (uncredited) See fewer	Adrenaline (2023)