Stream The Infernal Comedy: Confessions of a Serial Killer Online Free – Watch Full Movie from Home at 123Movies. . In 1976, Jack Unterweger was convicted for the murder of Margaret Schaefer and sentenced to life in prison. While imprisoned, he committed himself to reading and writing, eventually earning literary respect both inside and outside the penitentiary. In 1984, his autobiography "Fegefeuer" (Purgatory) became a bestseller.