As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTICED ONSET OF SIGNIFICANT VIBRATION, FOLLOWED BY OIL PRESSURE LOSS. SHUT DOWN LT ENGINE ON FINAL AT KMSP. PILOT NOTIFIED MSP TOWER OF ENGINE FAILURE. ONCE ON GROUND UPON COWLING REMOVAL THERE WAS EVIDENCE THE PISTON ROD ON NR 8 CYLINDER HAD A ROD BRAKE AND POKE A HOLE THROUGH THE CASE.