Originally Posted by
janiebluebird 
Curiosity got the best of me so I googled it and supposedly the rehab messed up and he died of a heart attack. I don't know how valid the source is but here's the thread I found on some other website about it. If you scroll down you'll see where someone said that:
So there's a show on NATGEO called "Drugged" The thread you provide is mainly just anonymous user comments referencing Facebook comments. I wouldn't call it a very valid source.
Regardless of how it happened it's a very sad story. Based on what the doctors were saying his organs were near failure, and i'm not surprised based on his physical state. A very important reminder to us all that while an extreme example, any one of us could be him some day if we aren't vigilant.