Cory Monteith's death is one of the most shocking and upsetting events of 2013. The 31-year-old actor was found dead in Canada on July 13, 2013, just months after he completed rehab. The actor had struggled with drug addiction since his early teens and this was not his first stint in rehab. (The first time he went he was only 19 years old.) We'd like to remember him as Glee's layered and talented hero, Finn Hudson. The loss for his friends, family, and co-stars must be beyond measure, and our hearts go out to them. 

We'll never forget Cory's beautiful voice on Glee. In his four seasons on the show, he sang plenty of memorable tunes, but we've picked our five favorites. Watch all of Cory's most memorable performances below:

1) "Girls Just Wanna Have Fun" — Season 3, "I Kissed a Girl"

2) "Losing My Religion" — Season 2, "Grilled Cheesus"

3) "Just the Way You Are" — Season 2, "Furt"

4) "Don't Stop Believin'" — Season 1, "Pilot"

5) "Faithfully" — Season 1, "Journey"

Bonus: Finn and Rachel's Final Duet, "We've Got Tonite" — Season 4, "I Do"