A woman drove her car into a tree on I-80 early Saturday morning, killing her passenger and injuring herself, according to California Highway Patrol.

The woman was driving a gold Toyota Corolla westbound on I-80 near the Willow Avenue offramp when she collided with the large tree. California Highway Patrol and emergency personnel arrived on the scene around 12:45 a.m., and pronounced the male passenger dead.

The driver was transported to a nearby hospital for major injuries, but is expected to recover.

No other cars were involved in the crash.

The crash remains under investigation. Anyone with information about the collision can contact CHP Contra Costa in Martinez at (925) 646-4980.