I have not heard alot of detail; perhaps someone else has. But what I did hear was that he and Bob Avalia were giving a cow horse demo at the NFR and he broke his leg during the demo. He was euthansized. He was only 12 and was retired in 2009 from competition, after having earned $300,000+.
His career wins:
2009 World’s Richest Stock Horse, Champion
2009 World Greatest Horseman, Reserve Champion
2008 NRCHA Magnificent 7, Champion
2008 NRCHA Derby Open Bridle Spectacular, Reserve Champion
2007 AQHA High Point Working Cow Horse and Senior Cow Horse