Metro

Billerica woman killed in crash on I-495 in Westford

A Billerica woman died after she lost control of her car and slammed into a median on Interstate 495 in Westford Thursday night, State Police said.

The woman was identified Friday as 50-year-old Lynne Tierney of North Billerica. She was traveling in the northbound lane at about 5:55 p.m. when she lost control of her 2003 Chevrolet Trailblazer, State Police said in a press release Thursday.

She veered off the left side of the highway before striking the median and rolling over, the release stated.

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Tierney was alone in the car, police said.

The cause of the crash is under investigation.

Globe Correspondent Jacob Carozza contributed to this report. Adam Sennott can be reached at adam.sennott@globe.com