Donald Lee Mariacher had been missing since July 13. Dental records and other information was used to identify him.
The Pittsburgh Post-Gazette reports that Mercer County coroner J. Bradley McGonigle III has ruled the death accidental and cited environmental exposure as the cause. The coroner also said Mariacher's Alzheimer disease was a contributing factor in his death.
Information from: Pittsburgh Post-Gazette, http://www.post-gazette.com