Pennsylvania State Police are investigating one of their own after he was involved in a deadly crash.

Investigators say Pa. State Trooper Barry Searfoss, of Coatesville, was driving his pickup truck in the westbound lanes of the PA turnpike in Upper Dublin Township last Friday around 10:30 p.m. Searfoss, who was off-duty at the time, suddenly rear-ended a 1997 Lincoln Town car 4-door Sedan, according to police. The crash caused the car to burst into flames, killing the driver of the car, Robyn Williams, 21, of North Philadelphia. An autopsy report revealed Williams died from multiple blunt force injuries, thermal burns and smoke inhalation, according to the Philly Burbs.

Police say Searfoss underwent a sobriety test which he allegedly failed. He was then taken into custody where police say he was processed for a DUI before being released. A police spokeswoman says Searfoss had to turn in his gun and badge. He will work at a desk while the investigation continues. Montgomery County District Attorney Risa Ferman also confirmed her office is investigating Searfoss for suspected DUI.

Searfoss has been a trooper since 2001 and was stationed at the Valley Forge Casino.