As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, PILOT HEARD A CLUNK AND THE -GEAR IN TRANSIT- LIGHT CAME ON. RETURNED TO AIRPORT, PERFORMED FLY-BY WHICH CONFIRMED NOSE GEAR HANGING OUT BUT NOT FULLY EXTENDED. NOSE GEAR COLLAPSED ON LANDING. INVESTIGATION REVEALED THAT THE ACTUATOR SHAFT HAD SHEARED JUST ABOVE THE CLEVIS BOLT CONNECTING TO THE DRAG BRACE.