The airplane was substantially damaged during a loss of control following an aborted landing at about 1626 Central time. The Commercial pilot, sole occupant of the airplane, sustained fatal injuries. Visual conditions prevailed for the IFR flight from Austin, Texas. Witnesses observed the accident airplane descending at an approximate 40-degree nose-down angle with the right wing angled towards the ground, as if correcting for a crosswind. The nosewheel hit the ground first and then the right main wheel slammed very hard onto the runway. The airplane bounced back into the air, and subsequently flew into the terminal buildings roof. Witnesses reported that both engines were running at full power and sounded good.