DIXON (CBS SF/BCN) — A truck hit and killed a 47-year-old woman early Sunday morning after she stopped to help at a crash scene on Interstate Highway 80 near Dixon, according to the California Highway Patrol.

The initial crash occurred shortly before 2:40 a.m. Sunday on westbound Highway 80 west of Dixon Avenue. A black Mazda CX-5 rear-ended a silver Hyundai Elantra and came to rest blocking lanes of the highway, prompting several people to stop at the scene to try to assist, CHP officials said.

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Minutes later, a red Toyota Tacoma driven by 29-year-old San Francisco resident Mason Wessel drove into the collision scene and hit a silver Toyota Prius and then hit the Mazda and its driver, who was standing outside of the vehicle. The Tacoma continued and hit and killed the 47-year-old woman, a Dixon resident whose name was not immediately available.

The Mazda driver, a 31-year-old Vallejo man, suffered major injuries and was taken to a hospital in Vacaville, while the Prius driver suffered minor injuries and also went to the Vacaville hospital.

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Wessel was arrested on suspicion of felony driving under the influence of alcohol.

Authorities asked for anyone with information about the crash to call Officer Padilla at the CHP’s Solano-area office at (707) 428-2100.

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