TMZ has reported that according to Canadian Authorities, Cory Monteith died from a combination of heroin and alcohol.

The British Columbia Coroners Service stated that an autopsy and toxicological analysis show that the 31-year-old actor, famously known in 'Glee.' died from a "Mixed drug toxicity, involving heroin and alcohol." 

The actor has struggled with addiction for years and had checked himself into rehab only a few months back in April.