Himself - Presenter / Narrator

John Morrison

Acting

Himself - DCI, Metropolitan Police, 1983

Peter Jay

Acting

Himself - Criminal Defence Lawyer

Iain MacDhùghaill

Acting

Himself - Consultant Psychologist

Archie MacLullich

Acting

Himself - Journalist

Pàdraig MacAmhlaigh

Acting

Himself - Forensic Psychologist

Julian Booth

Acting

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

Brian Masters

Acting

Herself - Nilsen's Mother

Elizabeth Scott

Acting

Dennis Nilsen

Neil McKinven

Acting

Victim Jamie

Ryan Fletcher

Acting

DCS Chambers

John Paul Hurley

Acting

Young Nilsen

Lewis Brown

Acting

Nilsen's Grandfather

Finlay McLean

Acting

DCI Peter Jay

Nicholas Underwood

Acting

Solicitor

Andy Marjoribanks

Acting