"I think it's a brilliantly done documentary. It's extremely sad at the end, but it depicts what it was like - not just with them (Nirvana), but... with everybody I knew... And seeing that scene, those scenes at the end, kind of upset my stomach. I watched it with my 17-year-old daughter and to think Frances (Bean Cobain) produced it, and that was the footage she chose to be shown was really heavy." Former GUNS N' ROSES star Duff Mckagan was stunned by director Brett Morgen's acclaimed new documentary Kurt Cobain: Montage of Heck, which was co-produced by the tragic Nirvana star's daughter. MCKagan was one of the last people to speak with Cobain on a flight just days before the singer's death in 1994.