HARRISON — An Oxford teen was killed and three other people seriously injured Thursday night when the sport utility vehicle they were riding in went off Route 35 and hit several trees.

The driver, a juvenile, is the subject of a criminal investigation.

Capt. Jeff Davis of the Cumberland County Sheriff’s Office identified the dead man as 18-year-old Thomas C. McLendon of 81 School House Road in Oxford. He was a passenger in the back seat and was pronounced dead at the scene, he said.

Passenger Jacob R. Hill, 21, of 18 McWain Hill Road in Waterford was flown to Central Maine Medical Center in Lewiston with life-threatening injuries, Davis said. On Friday, he remained in serious condition, according to a hospital representative.

A third passenger, Timothy S. Coffin, 21, of 461 Black Guard Road in Waterford, was taken to Bridgton Hospital with serious injuries. He was treated and released, according to hospital spokeswoman Pamela Smith.

The driver was a juvenile female whose name was not released as she is the subject of a criminal investigation, Davis said. She also suffered serious injuries and was taken to Bridgton Hospital. As of Friday afternoon, no charges had been filed against her.

Davis said the crash occurred at 8:23 p.m. in the area of 142 Harrison Road when the 2003 Chevrolet Trailblazer went off a curve as it headed north toward Waterford from Harrison village. It crossed into the southbound lane and left the road, striking several trees, he said.

“At this time it appears that excessive speed may have been a contributing factor in the accident,” Davis said Thursday night.

Windham Police Department along with Cumberland County Sheriff’s detectives investigated the accident.