Elizabeth Yardley

Self - Criminologist

Geoffrey Wansell

Self - Author & Journalist

Ross Huguet

Self - Narrator (US version), Self - Narrator

Bobby Chacon

Self - FBI Special Agent, 1987-2014, Self - Retired FBI Special Agent, 1987 - 2014

Chris Carter

Self - Best-Selling Author & Former Criminal Psychologist

Geoffrey Osborne

Police Officer, Prof. Norbert Nedopil

Katherine Ramsland

Self - Forensic Psychologist

Brian Jarvis

Self - Former Detective Sergeant, Marion County Sheriff's Office

Fred Dinenage

Self - Narrator

Rex Julian Beaber

Self - Forensic Psychologist

Daniel Ryves

Police Officer

Harold Schechter

Self - Author, The Serial Killer Files, Self - Author, 'Deviant: The Shocking True Story of Ed Gein'

Susan Mustafa

Self - True Crime Author

Lars Larson

Self - Talk Show Host & Journalist

Cliff Shepard

Self - Retired Detective, LAPD

Stuart Hamilton

Self - Forensic Pathologist