State police are investigating an early-morning crash on Interstate 93 in Braintree that left a 29-year-old woman dead.
Investigators say the Taunton woman, whose name has not been released, got out of her 2003 Buick Rendezvous on Saturday after she lost control and struck a guardrail in the southbound lanes of the highway.
Police said a second car then slammed into the Buick, pushing it into the woman and killing her.
The driver of the second car, a 20-year-old Brockton woman, was taken to a Boston hospital with serious injuries.
No charges were immediately filed.