Dennis Nilsen is one of the most notorious serial killers in British criminal history. On the surface, a mild-mannered civil servant, his true persona was terrifying. He confessed to murdering and mutilating 15 young men over a four-year period. The documentary features exclusive interviews with former detectives and the families of his victims. It also includes never before seen recordings - and footage from the Nilsen prison interview the Home Office tried to ban. The film is narrated by David Tennant. . Subscribe to True Lives: https://bit.ly/3dBMxvl This film was first broadcast: 17 Sep 2020 Check us out on Facebook: https://www.facebook.com/OurStoriesChannel Watch More Documentaries True Lives - https://bit.ly/3A8xRMJ Up Close - youtube.com/@UpCloseITVS Our History - https://bit.ly/3rUpdhL Our World - https://bit.ly/3ftuckM Our Stories - https://bit.ly/3ynfFyk Taste - https://bit.ly/3OZoDcV Blueprint - https://bit.ly/3ZK5UdD True Lives brings you fascinating stories of social interest from around the world. You can discover award winning documentaries, films and groundbreaking reports that capture the complexities of our daily life, with stories that will entertain, inspire and inform. Content distributed by ITV Studios. #crime #documentary #documentaryevidence #realstory #truecrimetales #police #serialkiler #truelives