Monteith's girlfriend trying to piece together last days of his life

Lea Michele wants to find out what triggered Cory Monteith's relapse.

The 'Glee' star, whose boyfriend and co-star was found dead in his hotel room in Vancouver, Canada, on July 13, after accidentally overdosing on alcohol and heroin, is reaching out to his friends in the city in a bid to piece together the last few days of his life.