At about 04:00 Pacific time, a Cessna 340A crashed while on approach to land at Selma, killing the pilot and seriously injuring the passenger. The airplane departed the Part 135 air taxi companys base at San Luis Obispo about 02:35 and picked up a passenger at Paso Robles at about 02:50. En route to Selma, the pilot was receiving VFR flight following but reported the airport in sight and canceled the service. Witnesses said the airplane made two attempts to land on runway 28 and the final approach to runway 10. Ground fog was obscuring the airport and there was an estimated 500 feet of horizontal visibility. The airplane crashed into an embankment 176 feet from the runway 10 threshold. There are no lights prior to the threshold.