I looked up the registration (N777AJ) and found some more info on the incident:
http://forums.ubi.com/eve/forums/a/t...3/m/8711080335
http://planenews.com/ntsb.php?ev_id=...8X00156&kkey=1
Looks like they went into an overspeed situation, given the plane's cruising speed is
292 knots, and the FlightAware.com site shows their max speed was
419 knots at one point (although that's listed as ground speed, so that might be misleading.)