My guess: suicide.
Never head of this person and only know what a brief search shows, but his fame appears to have stemmed from a haphazard video selfie that somehow got a lot of views.
My guess is that after he had a chance to look back on his life and tenuous claim to talent, he became very discouraged.
He peaked too soon. It’s like being the Valedictorian and Homecoming Queen and the rest of your life is all downhill. Happens a lot.