He was 31 years old.
The handsome young actor was a rising star in Hollywood, gaining fame and legions of fans for his portrayal of a mild-mannered, hunky high school quarterback on "Glee," as he starred opposite his real-life girlfriend Lea Michele.
With his movie-star good looks, smooth vocals and boy-next-door charm, Monteith was one of those celebs who was easy to love. His laid-back, clean-cut style always had us swooning, whether he was sporting his trademark football jersey, a dapper tuxedo, or a Vancouver Canucks baseball cap (his favourite hockey team).
We take a look back at some of favourite moments in honour of the beloved actor.
Click through the slideshow below for our style tribute to Cory Monteith.
Cory Monteith as 'Finn' on Season Four of GLEE in a simple hoodie and grey tee. (Photo by FOX via Getty Images)
Cory Monteith and Lea Michele attend the 12th annual Chrysalis Butterfly Ball on June 8, 2013 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)
Cory Monteith arrives at the premiere of "New Year's Eve" in Los Angeles on Monday, Dec. 5, 2011, staying true to his Canadian roots in a sharp plaid shirt. (AP Photo/Matt Sayles)
This is one of our favourite Cory Monteith looks: the actor sports a sharp vest, striped tie and jeans, posing with girlfriend Lea Michele at the 2012 Do Something awards on Sunday, Aug. 19, 2012 in Santa Monica, Calif. (Photo by Jordan Strauss/Invision/AP)
All dressed up: Monteith in black and grey and Lea Michele in fuschia cut an elegant figure together at the 19th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 27, 2013 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)
Cory Monteith attends a 2012 Fox Network party in a simple black suit with a subdued tie accent.
Cory shows off his casual style in a leather jacket and plain gray t-shirt, with with Dustin Milligan before a screening of the film 'Shark Night 3D' in Los Angeles, Friday, Sept. 1, 2011. (AP Photo/Chris Pizzello)
Cory's slim black suit was perfect for the GQ Men of the Year Party at Chateau Marmont on November 13, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
Cory keeps things simple in sneakers, a black cardigan and a white button-down.
Monteith's style is accessible and appropriate for the Teen Choice Awards in Los Angeles, on August 7, 2012.
Cory Monteith opts for white-tie formal at the 2011 Emmy Awards.
A white polka-dot tie and a striped shirt look at the 2011 People's Choice Awards.
Cory and Lea are the picture of elegance at the 'American Horror Story: Asylum' Los Angeles premiere held at Paramount Studios on October 13, 2012 in Hollywood, California. (Photo by Tommaso Boddi/WireImage)
Another reason to love him: Monteith and Michele attend a Vancouver Canucks hockey game in Vancouver in matching Canuck ball caps -- Cory's favourite team.