Cast 15

1. John Morrison

   Himself - Presenter / Narrator

2. Peter Jay

   Himself - DCI, Metropolitan Police, 1983

3. Iain MacDhùghaill

   Himself - Criminal Defence Lawyer

4. Archie MacLullich

   Himself - Consultant Psychologist

5. Pàdraig MacAmhlaigh

   Himself - Journalist

6. Julian Booth

   Himself - Forensic Psychologist

7. Brian Masters

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

8. Elizabeth Scott

   Herself - Nilsen's Mother

9. Neil McKinven

   Dennis Nilsen

10. 

    Ryan Fletcher

    Victim Jamie

11. 

    John Paul Hurley

    DCS Chambers

12. Lewis Brown

    Young Nilsen

13. Finlay McLean

    Nilsen's Grandfather

14. Nicholas Underwood

    DCI Peter Jay

15. Andy Marjoribanks

    Solicitor

Crew 3