Steve Jobs was at the Obama dinner thing. He obviously isn't dead, but he does look really thin going by this photo from behind:

 

http://regmedia.co.uk/2011/02/18/obama_silicon_valley_dinner.jpg

 

Of course it might not be cancer, it could just be more mundane problems with organ rejection and his restrictive diet. Still, I miss the chubbier Steve Jobs from the late-1990s.