Approximately 10:30 CST, a PA-23-235 was landed without incident by a pilot-rated passenger when the owner/pilot collapsed while on a practice VOR approach to the Mineral Wells Airport. The owner died, but the two other occupants were uninjured. The right front seat passenger was a 600 hour pilot rated passenger with no twin experience. The passenger in the back seat contacted Mineral Wells Unicom and arranged for a multi-engine rated pilot to talk down the flying passenger. The plane landed without further incident. An autopsy and toxicology was performed on the owner and results are pending.