Patrick Mackay: One of Britain's Most Prolific Serial Killers | Murder Casebook Obsessed with the Nazi regime and known for torturing animals, Patrick Mackay was certified a psychopath at seventeen. Later, he started befriending elderly people before brutally murdering them and then sitting with their bodies as they died. **This film is under non-exclusive license from All 3. All rights reserved. We ask you to please contact us if you believe there are any copyright issues via you_tube@valleyarm.com** See our curated list of our best and favourite True Crime Documentaries: https://bit.ly/45yLtRZ Want to watch how Forensics solves crimes? Check out the Forensics playlist: https://bit.ly/3WELj7n Murder Made Me Famous Playlist: https://bit.ly/3WEuw4o ______________________________________________________ ★ Subscribe to get more True Crime Central content and hit the notification bell to see freshly uploaded content. https://bit.ly/SubscribetoTCC We hope you've enjoyed our True Crime Content - let us know if you want us to cover any cases in particular! We'll see what we can do. Watch more here: https://bit.ly/3rMw8ch #truecrime #crimestories #serialkillerdocumentary