Answer
Three HBO documentaries featured Kuklinski: "The Iceman Tapes: Conversations with a Killer", "The Iceman Confesses: Secrets of a Mafia Hitman", and "The Iceman and the Psychiatrist: The Story of Richard Kuklinski". These documentaries provide in-depth insights into Kuklinski's life, motives, and crimes, offering a comprehensive exploration of his infamous career as a contract killer.