A man in his mid-20s was killed Friday in a multi-vehicle collision in Castaic.
It was reported at 2:51 a.m. on the northbound Golden State (5) Freeway just south of Templin Highway, said California Highway Patrol Officer Patrick Kimball.
The man was pronounced dead at the scene, Kimball said.
Four people were reported injured, Kimball said.
Three people were trapped and in critical condition, according to Los Angeles County Fire Department Dispatch Supervisor Imy McBride.
Four vehicles, including a big rig, were involved in the crash, according to firefighters at the scene.
The CHP issued a SigAlert shutting down lanes Nos. 1, 2, and 3 of the northbound Golden State Freeway in the crash area.