Glee Star, Cory Monteith died from heroin and alcohol overdose – when will they learn, success doesn't guarantee fulfillment.

Cory Monteith died from a lethal combination of heroin and alcohol, it has been revealed. 

The Glee actor, who was found dead in his hotel room on Saturday at the age of 31, died from a 'mixed drug toxicity, involving heroin and alcohol,'  according to authorities. 

The British Columbia Coroners Service revealed the autopsy results on Tuesday. 

It follows claims the star led a 'double life' as a hard-worker when in Los Angeles, and a substance-abuser whenever he would return to his native Canada.

Monteith, who checked into rehab in March, managed to stay clean while on the Glee set, but his resolve to stay sober weakened whenever he visited Vancouver, a source told TMZ.

According to sources, Monteith's girlfriend and Glee costar Lea Michele, along with the rest of the hit television show's cast, were aware of his addiction problems and worked hard to keep him clean and sober.

Monteith allegedly never showed up for work under the influence of drugs or alcohol and abstained from these substances 'most of the time.'

But his life in Canada painted a different picture.

Monteith allegedly returned to his hometown of Vancouver often, and surrounded himself with friends who fueled his addiction.

Drugs and alcohol were reportedly 'always involved.'

Monteith's family is said to have been aware that he reverted back to his hard-partying ways in the North American city, but they were unable to help.

The Glee Project, a reality TV series where hopefuls competed for roles on Glee, has been cancelled after two season, the Oxygen network confirmed on Tuesday.

Sources insist the cancellation was unrelated to Glee star Cory Monteith's death, adding that the decision was made 'several weeks ago.' 

So sad, at just 31 when he should be enjoying life, he goes an kills himself. Money and Fame indeed doesn't bring fulfillment. Find PURPOSE, it does.