Just got in from the hospital and saw that. Said he had a severe illness. He was the former cup series champion and had 200+ wins over the years in truck, xfinity which used to be the busch series, and the cup series. I think he was respected for his driving, but not well liked.
Neither him or his brother Kurt really fit in with traditional Nascar to say the least. I think they were from Vegas. His brother really didn't get along but Kyle wasn't that bad. I don't think either one started on small dirt track like a lot of Nascar drivers, but were financed from their parents into cart and other racing then stock car, kinda like Jeff Gordon had been.