The crash was reported at 4:29 a.m. just west of Crossroads Parkway, according to the CHP. The unidentified victim was pronounced dead at the scene.
The highway patrol issued a SigAlert and, at 8:20 a.m., said the westbound side of the freeway would remain closed "until further notice." All lanes were reopened at 12:45 p.m.
The cause of the crash was not immediately known.