John Wayne Gacy (8 episodes)
Det. Rafael Tovar (8 episodes)
Chief of Detectives Joe Kozenczak (8 episodes)
Sam Amirante (8 episodes)
Lead Prosecutor Bill Kunkle (8 episodes)
Elizabeth Piest (8 episodes)
Harold Piest (8 episodes)
Kerry Piest (6 episodes)
Det. Allen Fanholm (5 episodes)
Kenneth Piest (4 episodes)
David Cram (3 episodes)
Det. Michael Albrecht (3 episodes)
Mary Amirante (3 episodes)
Patti Szyc (3 episodes)
Bessie Stapleton (3 episodes)
Rosemarie Szyc (3 episodes)
Bob Motta (3 episodes)
Jeffrey (3 episodes)
Samuel Stapleton (2 episodes)
Robert Donnelly (2 episodes)
Carol Gacy (2 episodes)
Marion Gacy (2 episodes)
Juanita (2 episodes)
Marko Butkovich (2 episodes)
Judge Louis Garippo (2 episodes)
Mary Jane (2 episodes)
Robert Piest (2 episodes)
Randy Reffett (1 episode)
Donald Voorhees Sr. (1 episode)
Donald Voorhees Jr (1 episode)
Teenage Gacy (1 episode)
Billy Carroll (1 episode)
Dale Landingin (1 episode)
Gladys (1 episode)
Fred Tovar (1 episode)
John 'Johnny' Szyc (1 episode)
Richard Szyc (1 episode)
Eldest Szyc Son (1 episode)
Cliff (1 episode)
Janitor (1 episode)
Lynn Meadows (1 episode)
Karen Gacy (1 episode)
Dr. Stein (1 episode)
Marlynn Gacy (1 episode)
Eugenia Godzik (1 episode)
Young Marion Gacy (1 episode)
Dr. Healy (1 episode)
Rookie Cop (1 episode)
Billy Kindred (1 episode)
John Davis (1 episode)
Sophia St. Laurent (1 episode)
Guard Jenkins (1 episode)
Young Woman 1 (1 episode)
Young Male (1 episode)
Hot Girl (1 episode)
Delivery Man 1 (1 episode)
Waitress (1 episode)
Delivery Man 2 (1 episode)
Timothy McCoy (1 episode)
John Butkovich (1 episode)
Phil Torf (1 episode)
Detective Janus (1 episode)
Detective Everford (1 episode)
Jerry Latherow (1 episode)
Randy Reffett (1 episode)
Michael Rossi (1 episode)
Philip Paske (1 episode)
Terry Sullivan (1 episode)
Greg Godzik (1 episode)
Geraldine (1 episode)
Charlie Reynolds (1 episode)
Press Conference Reporter (1 episode)
Reporter (1 episode)
Reporter (1 episode)
Rose Perino (1 episode)
Ron Dovenek (1 episode)
Fred Richman (1 episode)
CPD Officer O'Neal (1 episode)
Genie Godzik (1 episode)
Deanna Amirante (1 episode)
Delores Nieder (1 episode)
Director (2 episodes)
Director (2 episodes)
Director (2 episodes)
Executive Producer (8 episodes)
Writer (1 episode)
Executive Producer (8 episodes)
Executive Producer (8 episodes)
Executive Producer (8 episodes)
Executive Producer (8 episodes)
Writer (1 episode)
Writer (1 episode)
Writer (1 episode)