Cory Monteith passed away one year ago and on the first anniversary of his death, his fellow 'Glee' co-stars and series creator Ryan Murphy are paying tribute to the late actor on Twitter.

Monteith was discovered dead in his Vancouver hotel room on July 13, 2013. The 31-year-old actor had been battling substance abuse problems and had relapsed after a brief stint in rehab months earlier.

The actor, who played the character of Finn on the show, was dating 'Glee' co-star Lea Michele at the time. Michele has since paid tribute to Monteith through her song, 'You're Mine.' The show also paid tribute to Monteith during its 100th episode broadcast.

Below are some of the remembrances that have been posted so far today by Michele, Matt Morrison, Kevin McHale, Harry Shum Jr., Amber Riley, Jenna Ushkowitz, Lauren Potter and series showrunner Ryan Murphy.