Authorities say 20-year-old Ralph White III was leading police on a chase on I-80 in Rodeo, after he stole a car.
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That's when he reportedly hit another car, which carried the mother and her two twin boys.
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The mom died in that crash and the twins were taken to the hospital with injuries but one of the boys, who was in critical condition, later died.
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White, who also ran from the scene and was later found and arrested at a nearby liquor store, is expected in court Wednesday for his arraignment.
He has been charged with vehicular manslaughter, possession of a stolen vehicle, and three counts of pursuit causing death or great bodily injury.