A Saco woman is dead after police say she drove her vehicle into oncoming traffic, causing a three-vehicle crash.

Department of Public Safety spokesman Steve McCausland says State Police are now trying to determine why 22-year-old Sierra Prescott was traveling in the wrong lane of I-95 in Augusta. She was killed instantly in the crash.

A second woman, who was a passenger in one of the other cars, was critically injured. 44-year-old Shuba Raja was flown by LifeFlight helicopter to Central Maine Medical Center in Lewiston. Raja was a passenger in a car driven by 40-year-old Vikram Kumar of Bangor. The third vehicle involved in the accident was driven by 61-year-old Frederick Homans of Northport. Both Kumar and Homans were taken to MaineGeneral with minor injuries.

The northbound lanes of the interstate were closed for three hours, as troopers investigated the accident, which happened at around 8:30 Saturday night.

The crash remains under investigation.