At 1411 Central time, the airplane collided with terrain while performing aerobatic maneuvers. The airline transport pilot and passenger were fatally injured. Visual conditions prevailed. A witness reported the airplane performing a hammerhead-type maneuver. The witness reported a second maneuver was performed from which the airplane did not recover. The witness reported the engine sputtered and sounded like it went to idle as the airplane spun toward the terrain.
