ANTIOCH (CBS SF) — A 57-year-old woman died after a vehicle struck her while she rode her bicycle in Antioch on Monday morning, according to police.

Around 8:21 a.m. Monday, officers responded to reports of a collision between a vehicle and bicyclist on James Donlon Boulevard near G Street and arrived to find the woman unresponsive with major head injuries.

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The woman, identified by the Contra Costa County coroner’s office as Antioch resident Amy Day, succumbed to her injuries at a hospital later in the day, police said.

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The driver of the vehicle stayed at the scene and cooperated with investigators, who do not believe impairment was a factor in the collision.

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