Name	Known for
Mark Williams-Thomas Self - The Investigator Self - The Investigator See fewer	Waking the Dead (2000)
Rick Warden Russell Causley Russell Causley See fewer	The Sixth Commandment (2023)
Tanya Winsor Carole Packman Carole Packman See fewer	Edie (2017)
Frances Millar Patricia Causley Patricia Causley See fewer	Eliminators (2016)
Alice Harding Sam Gillingham Sam Gillingham See fewer	Callum (2012)
Jason Allen DC Paul Donnell DC Paul Donnell See fewer	Exhibit A (2007)
Nazir Afzal Self - Former Chief Crown Prosecutor for North West England Self - Former Chief Crown Prosecutor for North West England See fewer	Honour (2020)
Patricia Causley Self Self See fewer	The Investigator: A British Crime Story (2016)
Lesley Gardiner Self - Investigation Team Self - Investigation Team See fewer	ITV Exposure (2011)
Neil Gillingham Self - Sam's son Self - Sam's son See fewer	The Killer in My Family (2019)
Sam Gillingham Self - Daughter Self - Daughter See fewer	The Killer in My Family (2019)
Chris Hackett Self - Investigation Team Self - Investigation Team See fewer	Nicola Bulley: The Disappearance That Gripped Britain (2024)
Rebecca Hoggarth Self - Investigation Team Self - Investigation Team See fewer	The Cancellation of Jim Davidson (2024)
Riette Leblanc Self - Former Canadian Police Officer (archive footage) Self - Former Canadian Police Officer (archive footage) See fewer	The Investigator: A British Crime Story (2016)
Jackie McKinley Self - Osteoarchaeologist (as Jacqueline McKinley) Self - Osteoarchaeologist (as Jacqueline McKinley) See fewer	Out of This World (1994)
Dave Norcott Self - Geoarchaeologist Self - Geoarchaeologist See fewer	The Investigator: A British Crime Story (2016)