Dark Secrets – Inside the Mind of a Mafia Hitman (2002)

“This ‘biography’ of sorts details some of the murders committed by notorious hitman Richard Kuklisnski, who reportedly killed over 100 people. This documentary, featuring interviews with Kuklinski himself, displays all the murders just as they happened. These events are told by Kuklinski, who gives his own personal perspective on what he did, and gives his feelings on what he did.” -imdb.com