As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS AIRCRAFT WAS INVOLVED IN AN ACCIDENT WHICH RESULTED IN THE PILOT'S SEAT COMING DISCONNECTED FROM THE SEAT TRACK. THE LEFT SIDE SEAT BRACING WAS BENT. THE PILOT RECEIVED SERIOUS HEAD INJURIES. A SUPPORT BETWEEN THE LEFT AND RIGHT SEAT VERTICAL BRACING MAY HAVE PREVENTED THIS.