Fog Contributes to 2 Serious Accidents : Traffic: A man is killed near the El Toro Y after his car stalls on the freeway. A woman is critically hurt in Anaheim when a train strikes her vehicle.

The thick early morning fog that crept in over Orange County on Saturday was blamed for at least one traffic fatality and an accident involving a train and a car that left a woman seriously injured.

Milan Allred, 58, of Laguna Niguel was killed around 7:15 a.m. after his car broke down on the San Diego Freeway near the El Toro Y.

Allred had flagged down a passing motorist, who agreed to help push Allred’s disabled car off the road.

In the dense fog, a third motorist sideswiped the good Samaritan’s car, then hit Allred, police said.

The driver of the third car fled but later was caught and arrested by California Highway Patrol officers.

Saysamone Bounkhoune, 26, of Fresno, was jailed on suspicion of second-degree murder, felony hit-and-run and felony drunk driving.

In Anaheim, an Amtrak train hit a car in dense fog early Saturday, seriously injuring Leonora Sproul, 60. She remained in critical condition Saturday afternoon after surgery at UCI Medical Center in Orange, a hospital official said.

The accident occurred about 7 a.m. on the railroad tracks near Orangethorpe Avenue east of Crowther Avenue.

At the time, visibility was limited to 100 feet because of fog. Sproul’s 1992 Mercury was on the tracks facing west, said Anaheim police, who did not know why the car was on the tracks. Crossing gates were operating properly, an Amtrak supervisor said.

Amtrak’s Southwest Chief came through the intersection at about 60 m.p.h. The engineer saw the car and applied the emergency brakes but could not avoid the crash, police said. The westbound train, en route from Chicago to Los Angeles, plowed into the car and propelled it about 150 feet down the tracks.

Sproul was thrown from the car and suffered severe injuries to both legs and possible internal injuries, police said.

An Amtrak employee applied a tourniquet to the woman’s wounded leg with help from a doctor who was a passenger on the train, said Robert Ralston, a supervisor at Amtrak West operations at Los Angeles.