A woman in a sport-utility vehicle was killed early Sunday when the SUV hit a semi-truck pulled over on the 5 Freeway north of Castaic, authorities said.
The accident occurred about 4 a.m. on the northbound freeway, according to the California Highway Patrol. The unidentified victim died at the scene.
It was not immediately clear whether she was the driver of the vehicle or a passenger, authorities said.
A portion of the freeway was closed while workers cleared debris.
The driver of the truck had pulled over and was asleep at the time of the accident, authorities said.