This is just terrible, terrible news, and a complete shock.
I first learned of Aaron through his posts at Alt.Movies.Monster back in late 1997. At that time, as I recall, his site was news and photos -no forum - web forums such as this had yet to supplant news groups as the primary source of online discussion/debate. But, as I said, Aaron frequented AMM and I always looked forward to reading his learned and intelligent posts about the genre. I never met Aaron, but I did exchange e-mails with him a couple times, and of course some discussions on Alt Movies Monster as well. I was one of the people who stayed up late to watch the webcast of Godzilla 2000 as it was being filmed - I took a couple screencaptures of the webcast, and shared them with Aaron.
I know I'm rambling here - I am truly stunned. He always struck me as a decent guy - He was waaaay too young to pass on - I'm dreadfully sorry that he got cheated out of so many years of his life.