HERCULES -- A woman who died after being thrown from her disabled vehicle when it was struck on the shoulder of Interstate 80 on Tuesday afternoon has been identified as 53-year-old Lillian Elisaia of Vallejo, the Contra Costa Coroner's Division said.

CHP officers responded to eastbound Interstate 80 at the Willow Avenue offramp about 2:20 p.m. after reports that an SUV had collided with a dark, late-model Mercedes sedan that was parked on the shoulder, CHP Officer John Fransen said.

Elisaia, who was sitting in the Mercedes' passenger seat and had already removed her seat belt, was ejected from the car after the SUV veered sharply off the road and into the sedan, Fransen said. Officers arrived to find the woman unconscious on the shoulder with her husband distraught at her side.

The woman was pronounced dead at the scene, Fransen said. Her husband, the driver of the Mercedes, was still wearing his seat belt at the time of the collision.

It was not immediately known why the female driver of the SUV went off the road, Fransen said.

The driver has not been charged with any crime, Fransen said Wednesday, and the cause of the crash is under investigation, pending the results of toxicology and forensics tests.

Contact Erin Ivie at 925-847-2122. Follow her at Twitter.com/erin_ivie.