"The Jinx: The Life and Deaths of Robert Durst" (2015)
Few documentaries have made a real-life impact like "The Jinx." Robert Durst was the central suspect in a string of murders for decades, but never went to prison. Durst, impressed by director Andrew Jarecki's film "All Good Things," partly based on his life, agreed to sit for 20 hours of interviews with him despite never granting other reporters any access.
Apparently, Jarecki's work helped law enforcement gather enough evidence. Durst was arrested the day before the documentary's finale aired on charges of first-degree murder.