Crimes That Shook the World S01 E04 The Vienna Strangler

The case of Austrian Jack Unterweger who, after serving a 14-year spell in jail for the murder of a girl in 1974, went on to become a celebrated media figure and an example of the reform system's effectiveness. However, since his release, it transpired he had killed up to 11 more people across Europe and America and he hanged himself in his cell after being given a life sentence without parole