A Fairbanks car-truck collision that left a woman dead Wednesday night is being investigated by Alaska State Troopers, who say the injured driver crossed into oncoming traffic.

Sarah H. Lawrence, 33, was killed and Lawrence Duffy, 81, was injured in the wreck at Mile 6 of Chena Hot Springs Road, troopers said in an online dispatch. Both were Fairbanks residents.

Troopers and medics responded just before 6 p.m. to a 911 call from a witness to the head-on crash.

“Upon arrival [Lawrence] was deceased and pinned in the wreckage of a 2017 Subaru WRX in the ditch at the westbound side of the highway,” troopers wrote. “[Duffy] was inside his overturned 2017 Ford F250 truck in the ditch at the eastbound side of the roadway. Initial scene investigation showed that Duffy was driving left of the double yellow center line when he collided with Lawrence’s vehicle in the inside westbound lane.”

Duffy was taken to Fairbanks Memorial Hospital, where he was treated for serious injuries. Chena Hot Springs Road was closed by the crash for at least three hours.

Troopers said they were “working closely” with Fairbanks District Attorney Greggory Olson’s office on the investigation.