Neil McKinven
В роли: Dennis Nilsen

Nicholas Underwood
В роли: DCI Peter Jay

Lewis Brown
В роли: Young Nilsen

Elizabeth Scott
В роли: Herself - Nilsen's Mother

Brian Masters
В роли: Himself - Author, 'Killing for Company - The Case of Dennis Nilsen'

Pàdraig MacAmhlaigh
В роли: Himself - Journalist

Archie MacLullich
В роли: Himself - Consultant Psychologist

Dr. Julian Boon
В роли: Himself - Forensic Pychologist

Iain MacDhùghaill
В роли: Himself - Criminal Defence Lawyer

Iain Moireasdan
В роли: Himself - Presenter / Narrator

Peter Jay
В роли: Himself - DCI, Metropolitan Police, 1983

Ryan Fletcher
В роли: Victim Jamie

John-Paul Hurley
В роли: DCS Chambers (as John Paul Hurley)

Finlay McLean
В роли: Nilsen's Grandfather (as Finlay MacLean)

Andy Marjoribanks
В роли: Solicitor