As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF AT LIFT OFF, THE NOSE FORK/WHEEL ASSEMBLY DEPARTED (FELL OFF) THE AIRCRAFT. RETURNED AND LANDED WITHOUT INCIDENT. AN INSPECTION OF THE NOSE GEAR REVEALED THE FORK RETAINING NUT WAS MISSING, IT HAD BACKED OFF. IT IS SUSPECTED THAT THE COTTER PIN HAD BEEN REMOVED DURING MAINTENANCE AND HAD NOT BEEN RE-INSTALLED.