Warning: This Glee "Finn Farewell" promo is going to stir your emotions. Actor Corey Monteith, who played Finn Hudson on the hit show, passed away on July 13, 2013. The final coroner's report on his death was released earlier this week, and confirmed that Monteith death was accidental and caused by a cocktail of heroin and alcohol. He had been dating co-star Lea Michele since the beginning of 2012. Just watching the preview has us a little teary eyed.