UPDATE: Officials tell ET that police have concluded their investigation and determined that Cory Monteith was alone when he died.
The BC Coroners Service has confirmed Cory Monteith died from a mixed drug toxicity, involving heroin and alcohol. Toxicology results did not indicate any presence of the drug fentanyl.
The post-mortem testing, which included an autopsy and toxicological analysis, seem to confirm this was an accident.
Monteith was found deceased in his room at the Fairmont Pacific Rim hotel in downtown Vancouver, British Columbia, shortly after noon on July 13. He had checked into the hotel on July 6 and had been expected to check out on the 13th. When he had not done so, hotel staff checked his room and found him deceased.