Cory Monteith

No one would have ever suspected that the young, talented star of Glee had been struggling with his own demons of depression and drug addiction since the age of 12.  Shortly after seeking help in March of 2013, Monteith was found dead in his Vancouver hotel room on July 13^th due to a combination of both heroine and alcohol.  He was only 31 years old and had a bright career ahead of him with long-time girlfriend (and costar), Leah Michele, by his side.

Image Source: hollywoodreporter.com