MOORHEAD, MN - The North Dakota Highway Patrol says it started around 9:50 Saturday night.
A trooper running radar in the eastbound lane of I-94 near the University Avenue exit clocked a 2004 Honda Civic going 67 mph in a 55 zone.
The trooper said he tried catching up to the car, reaching speeds of 120 mph, but the car was going faster than that and he was unable to catchup.
The trooper said he ended losing sight of the Civic as he had to slow down due to heavy traffic.
He eventually noticed the car had rolled into the median just east of Exit 1B in Moorhead.
Police say the driver, 43-year-old Crystal Davis of Fargo, and her passenger 35-year-old Dyllan Peltier of Fargo, were not wearing seatbelts and were tossed from the car.
Troopers say Peltier landed in the median, and was talking with first responders on scene.
They say Davis landed in the westbound lane and she was unresponsive.
Both of them were brought to Sanford Hospital.
Davis has life-threatening injuries.
Peltier is expected to survive.
Troopers are still trying to figure out why the car rolled since they had lost sight of it.
I-94 was closed in both directions for more than 30 minutes.