Here's the synopsis about a serial killing MD, no less:
Harold Frederick Shipman, known to acquaintances as Fred Shipman, was an English general practitioner and serial killer. He is considered to be one of the most prolific serial killers in modern history, with an estimated 250 victims. We delve into the psychology of Harold to try and understand what turned him into such a cruel murderer and how he managed to get away with it for so long.
As for the documentary on the doc (!), I'd say it's rather underwhelming—despite his crimes being so darn overwhelming.