An autopsy conducted Friday indicates a teen killed in a vehicle driven by a Piercefield resident that rolled over in Long Lake early Wednesday died of “severe blunt force neck injury,” according to state police.

Police said cause of the crash on NYS Hwy. 30 has been ruled accidental.

The teen, Joshua C. Peck, 20, Tupper Lake, was a front seat passenger in a 2008 Chervrolet truck driven by Jordan B. Amell, 17, Piercefield, a town in the southeast corner of St. Lawrence County.

Peck was found unconscious by state police and CPR was administered. He was transported by Long Lake Rescue Squad to Adirondack Medical Center in Saranac Lake, and was later airlifted to Fletcher-Allen Medical Center in Burlington, Vt. where he later died.

The autopsy was performed on Peck at the Office of the Vermont Medical Examiner by Pathologist Dr. Elizabeth Bundock, police said.

Cause of the accident remains under investigation by the State Police Collision Reconstruction Unit and Bureau of Criminal investigation, police said.

Amell was ejected from the truck following the accident at about 2 a.m. Wednesday when the vehicle left the east shoulder and overturned several times, police said.

Amell and another passenger, Matthew J. Corrow, 16, Tupper Lake, were also transported by Long Lake Rescue to the Adirondack Medical Center with minor injuries. They were treated and released, police said.