A tow truck operator was struck and killed by a driver in a big rig north of Castaic Friday night, according to the California Highway Patrol.
The incident occurred on the southbound 5 Freeway at Vista del Lago Road at around 8:15 p.m.
CHP said the man was changing a tire when he was struck by the big rig, and later died on the scene.
CHP received a description of the big rig and were searching for it.
Part of the 5 Freeway was shut down temporarily.