The BC Coroners Service is stressing "Glee" star Cory Monteith died of a so-called mixed-drug toxicity involving heroin and alcohol.
Toxicology results did not indicate any presence of the drug fentanyl.
Fentanyl is an extremely powerful pain killer, about 100 times more powerful than morphine, and can be deadly.
Police in Abbotsford are wondering if a heroin-related spike in overdoses in their community is in any way connected to fentanyl being mixed with the heroin.