British physician Harold Shipman may have killed as many as 400 of his patients during his medical career, which would make him the most prolific serial killer of all time. An official audit estimates the number of victims at 236 over 24 years, but the exact number will probably never be known.
From the Upcoming Queue, submitted by mrbabyman.
Sure he was convicted by the courts but the same courts have in the past supported slavery so are not exactly the apex of morality.
IN time this conviction will be over turned.