I was aware of the Necrotizing Fasciitis situation with Hanneman, and have been following that particular health situation as closely as I could. However, I knew Hanneman was the one guy in the band who generally stayed out of the public spotlight in his private life, so while I knew he liked to drink (in fact, drinking's been part of the rock 'n' roll culture since day one, and he's been known to be a fan of Heineken), I was not aware of the severity of his drinking problem until after his official cause of death was released, and this is coming from a Slayer fan since his late teens. Kerry is known to drink Jagermeister, but I know from his own admission that he does not abuse it.
Winehouse, on the other hand, I knew was an accident waiting to happen, because the only thing I've ever heard about her is drug abuse issues left and right. The only thing that shocked me about her death was the fact that she died at the same age as Robert Johnson, Brian Jones, Jimi Hendrix, Janis Joplin, Jim Morrison, and Kurt Cobain, placing her in the "27 Club" (although her self-destructive lifestyle certainly made her a candidate to join that infamous club).