Sad and awful news to lose such a talent and all round nice guy.
I cannot get my head round the fact that someone in his position could not get the absolute best help for his disabling illness.
RIP
Sadly the best help out there (for the addiction) is AA, and their companion organization NA. I say "sadly" because their success rate is only 50% and that is better by far than any other program.
Back on topic: RIP Robin, you will be missed.