Characters played by Casey Jordan
Self
Self - Criminologist
Characters played by Donnie Wahlberg
Self - Host
Self
Characters played by John Wayne Gacy
Self
Characters played by CeCe Moore
Self - Chief Genetic Genealogist at Parabon
Characters played by Sam Amirante
Self - Gacy's Attorney
Characters played by John Butkovich
Self - Murder Victim
Characters played by Eugenia Godzik
Self - Greg Godzik's Sister
Characters played by Terry Sullivan
Self - Fmr. Assistant State's Attorney
Cook-County
Characters played by Gregory Godzik
Self - Murder Victim
Characters played by Lauren Keene
Self - crime reporter
Characters played by Robert Winch
Self - Murder Victim
Characters played by Michael Bonnin
Self - Murder Victim
Characters played by Matt Murawinski
John Wayne Gacy
Characters played by Darrell Samson
Self - Murder Victim
Characters played by Mark G. Hewitt
Self
Characters played by John Stossel
20
Self - Fmr. Correspondent ABC News 20
Characters played by Paul Holes
Self - Ret. Cold Case Investigator
Contra Costa County D.A.'s Office
Characters played by Larry Crompton
Self - Ret. Detective
Sacramento County Sheriff's Dept.
Characters played by Carol Daly
Self - Ret. Detective
Sacramento County Sheriff's Dept.
Characters played by Michael Cabral
Self - Chief Deputy District Attorney Riverside County DA's Office
Characters played by Lori Orr Kovach
Self - John Orr's Daughter
Characters played by Marvin Casey
Self - Former Arson Investigator
Characters played by Cheryl Arutt
Self - Expert Forensic Psychologist
Characters played by Robert Graysmith
Self - Cartoonists San Francisco Chronicle
Characters played by Michael Renault Mageau
Self
Characters played by Rosalynn Carter
Self
Characters played by Carole Hoff
Self - John Gacy's Ex-Wife
Characters played by Barry Boschelli
Self - Gacy's Childhood Friend
Characters played by Pierre Bidou
Self - FMR. Detective Benicia Police Department
Characters played by Michael Butterfield
Self
Characters played by Mary Ellen O'Toole
Self - Ret. Senior FBI Profiler
Characters played by Dave Hachmeister
Des Plaine's Police Department
Self - FMR. Detective
Characters played by Tommy Boling
Self - Murder Victim
Characters played by Tom Voigt
Self - Founder Zodiackiller.com
Characters played by James Haakenson
Self - Murder Victim
Characters played by Les Lundblad
Self - Detective Sergeant
Characters played by Matthew Bowman
Self - Murder Victim
Characters played by Joey Jackson
Self - Legal Analyst
Characters played by Robert Gilroy
Self - Murder Victim
Characters played by John Mowery
Self - Murder Victim
Characters played by David Oranchak
Self
Characters played by Rick Johnston
Self - Murder Victim
Characters played by William Carroll
Self - Murder Victim
Characters played by Russell Nelson
Self - Murder Victim
Characters played by James Mazzara
Self - Murder Victim
Characters played by Randall Reffett
Self - Murder Victim
Characters played by William Kindred
Self - Murder Victim
Characters played by Alan R. Warren
Alan R Warren