Charles Manson? Maybe...

Charles Smith springs to mind also: 13 people sentenced and later released from  prison for killing small children based on "seriously flawed" autopsies. And a total of 20 "suspicious" investigations. And the College of Physicians and Surgeons only got around to popping the guy's license in 2011. Last I heard he was living in Vancouver.

Takeaway lesson: don't hold your breath waiting for any professional sanctions.