NORTH FRANKLIN TOWNSHIP (KDKA) — State Police are investigating a deadly late-night crash that claimed the life of a teenage boy on Interstate 70 in Washington County.

The crash happened around 11:20 p.m. Thursday on I-70 at the Chestnut Street exit in the North Franklin Township area.

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(Photo Credit: KDKA)

State police say 51-year-old Jonathan Gracey of Wheeling, West Virginia, was behind the wheel of a Honda in the westbound lane when he crashed into the rear of a tractor trailer, losing control of his vehicle and coming to rest against the guardrail.

The passenger-side of the vehicle was badly damaged. Sitting on that side of the car was Gracey’s 15-year-old son.

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The Washington County Coroner’s Office says the teen, identified as Robert Gracey, was pronounced dead at the scene. Police say it is unknown if the boy was wearing a seat belt.

Jonathan Gracey was transported to UPMC Presbyterian Hospital with serious injuries. State Police are investigating the crash as a DUI.

The 27-year-old truck driver, from Jacksonville, Florida, and was not injured.

Officials say both the father of the boy and the truck driver were wearing seat belts.

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The highway was shut down for nearly four hours for investigation and cleanup.