A Coroner

1. A public official who presides over an inquest into unnatural deaths, cases of treasure trove, and debris from shipwrecks.
2. (Canada, US) A medical doctor who performs autopsies and determines time and cause of death from a scientific standpoint.
3. The administrative head of a sheading.

(who presides over an inquest): medical examiner, ME (if he or she performs autopsies)

autopsier (rare)