WordNet (r) 3.0 (2006):

medical examiner
    n 1: a public official who investigates by inquest any death not
         due to natural causes [syn: coroner, medical examiner]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "medical examiner":
   Doctor of Medicine, GP, MD, allopath, allopathist,
   attending physician, autopsy, coroner, country doctor, croaker,
   doc, doctor, family doctor, general practitioner, house physician,
   inquest, intern, leech, medical attendant, medical man,
   medical practitioner, medico, mortality committee, necropsy,
   necroscopy, physician, physician in ordinary, postmortem,
   postmortem examination, resident, resident physician, sawbones