As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOWING TAKEOFF, AIRSPEED SLOWED. REAR ENGINE INSTRUMENTS INDICATED ENGINE WAS LOSING POWER. OIL PRESSURE WAS DROPPING AND THE PROPELLER WENT INTO FEATHER. THE ENGINE WAS SHUT DOWN AND A LANDING WAS MADE. AN INSPECTION OF THE ENGINE DETERMINED THE OIL PUMP HAD FAILED.