A man is facing charges after a wrong-way crash on I-376 killed two people and injured two others on Sunday. 

Pennsylvania State police announced on Monday that Pedro Morales will be charged with aggravated assault by vehicle, involuntary manslaughter and multiple other traffic violations. 

Police say that while the investigation is still ongoing, initial reports suspect Morales of driving under the influence at the time of the fatal crash. 

Allegheny County first responders were alerted to the incident between the Exit 71A (Grant Street) and Exit 71B (Second Avenue) interchanges just before 7:30 p.m. Sunday.

Pennsylvania State Police troopers were also called to the scene and launched an investigation into the incident.

Details from the investigation show that a Chevrolet Silverado was traveling eastbound in westbound lanes before the collision. The Silverado then struck a Nissan Frontier traveling westbound, per a media release from state police.

"It seems like they found the wrong way on the on-ramp right there near mile marker 71, and that's what caused that collision to occur," said Trooper Rocco Gagliardi.

The driver of the Nissan, identified as Shannon Morrow, was pronounced dead at the scene, and the passenger, Sharon Orlofske, 77, died after being taken to the hospital.

Morrow's boyfriend was driving the car in front of them and saw the wrong-way driver coming, swerving to get out of the way.

Tragically, not only was his girlfriend killed, but the passenger in Morrow's car, Orlofske, was his mother. 

"The boyfriend is in front of the girlfriend's vehicle. At that time, the boyfriend sees the Silverado coming at him in the wrong direction. He is able to quickly swerve out of the way and not get struck head-on. Unfortunately, at that time, he sees the Silverado go directly into the vehicle behind him," Trooper Gagliardi added.

The victims in the Silverado were transported to a nearby hospital.

"From a visual standpoint, with the damages of the Silverado going into that Frontier, speeds were at a higher rate than normal."  

The crash was cleared and the roadway was reopened just before 11:45 p.m. Sunday.

The investigation is ongoing with the assistance of the Pennsylvania State Police Collision Analysis and Reconstruction Specialists and Forensic Service Units.

Morales is still in the hospital being treated for injuries sustained in the crash. Police say that as soon as he is released, he will be arrested.