To make the news even sadder, he had left behind his girlfriend and co-star Lea Michele.
Prior to his death from alcohol and heroin overdose, she had given an interview telling the world just how in love they were.
Scroll for recent Ellen interview video
After the tragic news was announced she remained silent as she dealt with her grief.
It has been announced today that her first post, to her legion of fans, was in fact the most retweeted message of 2013.
Thank you all for helping me through this time with your enormous love & support. Cory will forever be in my heart. pic.twitter.com/XVlZnh9vOc— Lea Michele (@msleamichele) July 29, 2013
The post was, according to Twitter's year report, retweeted more than 408,000 times from 133 countries.
Since then Lea has gone back to work on Glee and spoken in some rare interviews about how lucky she feels to have known him.
She recently spoke on Ellen about her loss.
She said, "'I really feel like I'm still trying to figure out all of this.
It's been only a few months, but my mum has experienced a lot of loss in her life and she told me at one point, she said, there is an empowerment that comes with grief, at some point you find it.
It's very hard but you will find it and I think at a certain point you can choose to sort of fall from this or you can choose to rise.
And that's what I'm just trying to do my best for him because I know that that's what he would have wanted, and to just do my best and to you know, hopefully make something positive for where I go in the rest of my life."
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