Cory also voluntarily entered a treatment facility for his addiction in April . Monteith has been frank about his past , saying that he started using drugs at 13 . Coroner : The addicted neglect their primary relationships and they may lie , cheat and steal to continue drug use . Monteith died as a result of ` ` a mixed drug problem , involving heroin and cocaine ''
Cory also voluntarily entered a treatment facility for his addiction in April . Monteith has been frank about his past , saying that he started using drugs at 13 . Coroner : Monteith died as a result of ` ` a mixed drug problem , involving heroin and cocaine ''