The evening news is reporting that the crash occurred on the East side
of Lake Winnebago, near the town of Calumetville.
An eyewitness reported seeing the Mustang as part of a four aircraft
flight. It unexpectedly went inverted and did not recover, impacting the
ground at high speed. What little debris was visible above ground was
consistent with Dick's aircraft.
>From EAA.Org
Warbird Pilot Dick James Killed in Fond du Lac County Crash
July 27, 2005 -- EAA is saddened to report that a World War II-era
aircraft that had participated in our "Warbirds" air show Tuesday
afternoon crashed in Fond du Lac County as it was staging to participate
in a later segment of the show, resulting in the death of the pilot,
Dick James of Fennimore, Wisconsin.
The accident occurred in a rural area in the northeastern part of the
county. The Fond du Lac County Sheriff's Office and the National
Transportation Safety Board, with assistance from the Winnebago County
Sheriff's Office, are spearheading the investigation.
The entire EAA family, especially the EAA Warbirds of America, offers
our sincerest condolences to the James family.
That's why I theorized a heart attack but carbon monoxide sounds plausible, too.
The plane was straight and level and then for some reason just rolled over and fell out of formation with no apparent attempt to recover.
They may never release the pilot's autopsy. We'll have to wait for the final NTSB report a year or so from now.