Cory Monteith Death: Darren Criss Speaks Out on Conan (VIDEO)

Darren Criss (Blaine) shared a beautiful message about his "dear friend,” Glee co-star Cory Monteith, during the August 1 episode of Conan O'Brien's late night talk show. Cory died on July 13 of a heroin and alcohol overdose. Glee is working on a Cory Monteith tribute for Season 5, Episode 3. Catch up on all the known details up to this point.