So sad to see this. I'm sure I'm far from the only one who was drawn to EDM through his music, even if only a little bit. I never knew how young he was, so this was even more shocking to me.

No official cause has been released yet, but he has had issues with alcoholism and depression. 

http://people.com/music/swedish-deejay-avicii-dead-28/

In early 2016, he announced his retirement from touring in a lengthy letter to fans on his website. Avicii suffered from ongoing health problems, including acute pancreatitis which caused him to have his gallbladder and appendix removed four years ago.