i was at the show and heard pilot declare emergency. ac was routed to east of the field and pilot indicated possibility of needing to eject. he reported he was going to fly away from populated areas and again indicated he may need to eject. thereafter indicated he was having difficulties with control and was ejecting. shortly afterwards he reported "ejection failure" and the aircraft impacted the ground. I saw no parachute deploy.
....gets the old lip wobbling! Very brave and, sadly, tragic!