Self - Narrator (10 episodes, 2016-2018)
Self - Head of Psychology, Birmingham City University (10 episodes, 2016-2018)
Self - Forensic Psychologist, RCSI (9 episodes, 2016-2018)
Self - Criminal Psychologist, Manchester Metropolitan University (7 episodes, 2016-2018)
Self - Psychologist (6 episodes, 2016-2018)
Self - Author & Expert on Serial Killers (6 episodes, 2016-2018)
Self - Forensic Psychologist (6 episodes, 2016-2018)
Self - Consultant Psychologist (3 episodes, 2016-2018)
Self - Journalist & Crime Writer (2 episodes, 2016)
Self - Former Detective Chief Inspector, Metropolitan Police (2 episodes, 2016)
Self - London School of Economics (1 episode, 2016)
Self - Jonestown Survivor (1 episode, 2016)
Self - Pathologist (1 episode, 2016)
Self - Killing for Company (1 episode, 2016)
Self - Consultant Pediatrician (1 episode, 2018)
Self - Joanna Dennehy's Biographer (1 episode, 2016)
Self - Attempted Abduction Victim (1 episode, 2016)
Self - Plumber (1 episode, 2016)
Self - Father of Liam Taylor (1 episode, 2018)
Self - Editor, Gloucester Citizen (1 episode, 2018)
Self - Joanna's Former Partner (1 episode, 2016)
Self - Bamber's Cousin (1 episode, 2016)
Self - Psychologist (1 episode, 2018)
Self - Griffiths's Former Girlfriend (1 episode, 2016)
Self - Former Essex CID (1 episode, 2016)
Self - Investigating Officer Merseyside Police (1 episode, 2016)
Self - Daughter of Fred & Rosemary West (1 episode, 2018)
Self - Beverley Allitt's Former Fiance (1 episode, 2018)
Self - Forensic Psychologist, Kings College London (1 episode, 2016)
Self - Lawyer (1 episode, 2016)
Self - Landlord (1 episode, 2018)
Self - Neuroscientist, University of California (1 episode, 2016)
Self - Owner, Cannibal Cafe (1 episode, 2016)
Self - Neighbor (1 episode, 2018)
Jeffery Dahmer (1 episode, 2016)
Self - Former Detective Superintendent, Strathclyde Police (1 episode, 2016)
Self - Former PC, Nottinghamshire Police (1 episode, 2016)
Self - Caroline Clarke's Father (1 episode, 2016)
Self - White House Farm Secretary (1 episode, 2016)
Self - Former Colleague (1 episode, 2018)
Self - Deputy Chief Constable, Essex Police (1 episode, 2016)
Self - Detective Chief Superintendent, Staffordshire Police (1 episode, 2016)
Self - Former Staff Nurse (1 episode, 2018)
Self - Steve Wright's Ex-Wife (1 episode, 2018)
Self - Former Colleague (1 episode, 2016)
Self - Former Girlfriend (1 episode, 2016)
Self - Huntley's Former Partner (1 episode, 2016)
Self - Nursing Auxiliary (1 episode, 2018)
Self - Trial Judge (1 episode, 2016)
Self - Former Chief Superintendent, Metropolitan Police (1 episode, 2016)
Self - Senior Staff Nurse (1 episode, 2018)
Self - Chief Supt, Ipswich Police (1 episode, 2018)
Self - Forensic Psychologist (1 episode, 2016)
Self - Friend of Gemma Adams (1 episode, 2018)
Self - State Enrolled Nurse (1 episode, 2018)
Steve Wright's Stepmother (1 episode, 2018)
Self - Former Detective Superintendent, Lincolnshire Police (1 episode, 2018)
Self - Lynsey's Mother (1 episode, 2016)
Self - History of Medicine, Oxford Brookes (1 episode, 2018)
Self - Lynsey's Father (1 episode, 2016)
Self - Auschwitz Survivor (1 episode, 2018)
Self - Former Detective Superintendent, Merseyside Police (1 episode, 2016)
Self - Lynsey's Sister (1 episode, 2016)
Self - Lawyer (1 episode, 2018)
Self - Ex-CEO, Child Protection Agency (1 episode, 2018)
Self - Suffolk Police (1 episode, 2018)
Self - Cambridgeshire Police (1 episode, 2018)
Self - Granddaughter of Shipman Victim (1 episode, 2018)
Self - Murder Victim (1 episode, 2016)