A tractor-trailer crash on Interstate 79 in Allegheny County killed two, including one Butler resident, shortly after midnight on Thursday, Sept. 28.

Frank L. Tupper Jr., 54, was identified as one of the deceased by the Allegheny County Medical Examiner’s Office on Friday afternoon, a Pittsburgh newspaper reported.

According to state police, the crash happened shortly before 12:30 a.m. Thursday, near mile marker 67 on I-79, near Sewickley in Allegheny County. A southbound tractor-trailer crossed the median and went into the northbound lanes, where it hit another vehicle head on. Both vehicles were pushed into an embankment, after which the trailer portion of the tractor-trailer collided with a second vehicle traveling north.

The tractor-trailer and the vehicle it collided with caught fire and were completely engulfed in flames. Both drivers were pronounced dead by medical staff at the scene, state police said.

The crash is under investigation, according to a state police news release.