Calificación
Reparto

John Morrison
Himself - Presenter / Narrator

Peter Jay
Himself - DCI, Metropolitan Police, 1983

Iain MacDhùghaill
Himself - Criminal Defence Lawyer

Archie MacLullich
Himself - Consultant Psychologist

Pàdraig MacAmhlaigh
Himself - Journalist

Julian Booth
Himself - Forensic Psychologist

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

Elizabeth Scott
Herself - Nilsen's Mother

Neil McKinven
Dennis Nilsen

Ryan Fletcher
Victim Jamie

John Paul Hurley
DCS Chambers

Lewis Brown
Young Nilsen

Finlay McLean
Nilsen's Grandfather

Nicholas Underwood
DCI Peter Jay

Andy Marjoribanks
Solicitor