Erbarmungslos (Documentary, German)
Genres: Crime
Status: Ended
Premiered: 2018-11-22
Ended: 2019-01-26
Network: ZDFinfo
Country: DE
Runtime: 45 minutes
Criminal psychologist Lydia Benecke and profiler Stephan Harbort examine the mental states of historical serial killers, like Jack Unterweger, Guy Georges, Joanna Dennehy, Israel Keyes and others.