Himself - Presenter / Narrator
John Morrison
Himself - DCI, Metropolitan Police, 1983
Peter Jay
DCS Chambers
John Paul Hurley
Young Nilsen
Lewis Brown
Nilsen's Grandfather
Finlay McLean
DCI Peter Jay
Nicholas Underwood
Solicitor
Andy Marjoribanks
Himself - Criminal Defence Lawyer
Iain MacDhùghaill
Himself - Consultant Psychologist
Archie MacLullich
Himself - Journalist
Pàdraig MacAmhlaigh
Himself - Forensic Psychologist
Julian Booth
Himself - Author, 'Killing for Company - The Case of Dennis Nilsen'
Brian Masters
Herself - Nilsen's Mother
Elizabeth Scott
Dennis Nilsen
Neil McKinven
Victim Jamie
Ryan Fletcher
Director
Eleanor Yule
Writer
Patsi Mackenzie