Watched the documentary, really sad. I think of him often. It's so sad that someone who brought so much joy to so many, was so unhappy within himself.
There was a lot of criticism after he died, having published his book and claiming to be sober, but I don't believe he was lying or pretending to be sober when he wasn't. I think he just couldn't stay on the wagon. He cleaned up quite a few times, but sadly just couldn't stay clean. Addiction is complex and you're not just cured one day and that's it, it's a lifelong effort.