Real Dictionary

coroner
countable noun: A coroner is an official who is responsible for investigating the deaths of people who have died in a sudden, violent, or unusual way.

coroner in American English
a public officer who determines by inquest, sometimes with a jury, the causes of any deaths not obviously due to natural causes
noun: an officer, as of a county or municipality, whose chief function is to investigate by inquest, as before a jury, any death not clearly resulting from natural causes

coroner in British English
noun: a public official responsible for the investigation of violent, sudden, or suspicious deaths and inquiries into treasure trove. The investigation (coroner's inquest) is held in the presence of a jury (coroner's jury)