I mean this in a friendly way - don't get too outraged about coroners. Indiana has a coroner system, which means that each county has an elected official called a coroner who completes a "death investigation," but this is more of an administrative role than anything resembling an investigation as a member of the public would think of it. The coroner could be a doctor but often is a nurse or even a funeral home director if the county is rural. The coroner administratively certifies whether a death was a homicide, suicide, natural causes etc but that's not just one person's decision; if there is any thought that the death is unnnatural, LE would contribute to that. And if it's decided that an autopsy is to be performed (a decision also made in conjunction with LE), that's still done by a certified forensic pathologist who has undergone years of training and board testing. Marion County, Indiana has a nice website that explains this pretty well:
indy.gov
In the Delphi case, the coroner in the county at that time was a person who was pretty young/new in position but IMO his job mainly was just to certify the death certificates and probably arrange for the bodies to be transported to autopsy. This was cited in a recent previous thread, but the autopsies of the Delphi victims were performed by a forensic pathologist named Dr. Roland Kohr who was stationed in Terre Haute.