This rogues' gallery of healthcare's most heinous professionals have a combined kill count in the hundreds. Whether out of mercy, to ease their patients' pain, like Dr. Jack Kevorkian, or sheer lust for murder, like Charles Cullen, these doctors and nurses make you think twice about checking into a hospital that you may not check out of.

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.

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From the Upcoming Queue, submitted by mrbabyman.