It's hard to believe three years have gone by since Glee star Cory Monteith tragically passed away at only 31 years old.

Largely remembered for his portrayal of musically inclined football star Finn Hudson on the Fox hit, Monteith was admired—both on and off camera—by fans, costars and family—and he remains very much missed.

To mark the day, a number of Monteith's co-stars, including former girlfriend Lea Michele, took to social media to pay tribute to the actor.