Sad to hear, but even he and the doctors predicted it coming.
That said, he was a great super heavyweight. Another case of a guy who had a great look, but in WWF, at least, he was vastly undervalued. Seriously, they couldn't give him eve ONE run as WWE Champion? Nash got a whole year, yet there was no room for Vader in there? At least WCW did that.
When I think about pro wrestling, heavyweights, characters with charisma, a imposing look and sound and in-ring ability I can definitely think of Vader. Loved the mask and the whole persona. Well, at least he can be remembered well by people who would like to do that.