Such a loss  

Most of the Guys I camped with are friends of Dick James.  He lived pretty close to us and has been a regular at our local LaCrosse Show for years.  It was a big downer that night. 
From whatever gathered,  It was most likely a Medical issue.  
He was flying formation when his plane pulled up slightly and began a slow roll.  it continued the roll until it was heading straight down.   It was estimated he was about 300kts when he hit the ground.   The plane left a large crater and there was must left but debrise.
Im sure the NTSB will release its finds down the road, but that what I know at this point.
My thoughts and prayers are with the James family.