CONCORD (CBS SF) — A 26-year-old Richmond woman died Saturday afternoon in a solo-crash off eastbound state Highway 4 in unincorporated Contra Costa County, a California Highway Patrol officer said.

The crash was reported just after 3 p.m. after the woman in a 2014 Nissan Maxima went off the south side of the highway at the Mc Ewen Road on-ramp to eastbound Highway 4, CHP officer Brandon Correia said.

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The Nissan went down an embankment and the victim was ejected from the car and died.

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The name of the victim is not being released yet, CHP officials said.

Authorities don’t know whether drugs or alcohol played a role in the crash. Anyone who saw it or the events leading up to it is asked to call the CHP at (925) 646-4980.

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