What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) The pilot, with one (1) passenger on board, departed Martinsville, Virginia (mtv) for chapel hill, north carolina. After departure, at approximately 300' AGL, the cabin door opened. The pilot returned to mtv for landing, thinking that the gear had not been retracted. A normal approach to landing was accomplished, however, the gear was not extended, and the aircraft landed gear up. The aircraft sustained minor damage with no injuries to the passenger or pilot.
As the FAA filed it
(-23) THE PILOT, WITH ONE (1) PASSENGER ON BOARD, DEPARTED MARTINSVILLE, VIRGINIA (MTV) FOR CHAPEL HILL, NORTH CAROLINA. AFTER DEPARTURE, AT APPROXIMATELY 300' AGL, THE CABIN DOOR OPENED. THE PILOT RETURNED TO MTV FOR LANDING, THINKING THAT THE GEAR HAD NOT BEEN RETRACTED. A NORMAL APPROACH TO LANDING WAS ACCOMPLISHED, HOWEVER, THE GEAR WAS NOT EXTENDED, AND THE AIRCRAFT LANDED GEAR UP. THE AIRCRAFT SUSTAINED MINOR DAMAGE WITH NO INJURIES TO THE PASSENGER OR PILOT.