One person is dead after a police shooting on I-279. 

Originally, the section of southbound I-279 was shut down due to "police activity," a PennDOT spokesperson confirmed Saturday night. 

That closure, between southbound I-279 and the Camp Horne Road (Exit 8) interchange, lasted for hours. 

The shutdown occurred because several police agencies were chasing an SUV out of Butler County and into Allegheny County. At some point during the chase, the driver of the SUV lost control and crashed, flipping over at least twice. 

Shortly after the crash, shots were fired.

All four occupants of the SUV were taken to the hospital, where one of them later died. 

"We took a couple of people back to certain locations for interviews to see why the officer-involved shooting occurred, what happened before, during, and after the crash and pursuit, and what led to those shots being fired," said Pennsylvania State Police Trooper Rocco Gagliardi.

Man killed was a suspect in separate shooting

The man killed was a suspect in a separate shooting in the city of Butler just 24 hours earlier.

Butler City police say they identified 20-year-old Devin Russell as a suspect in a shooting that left a 17-year-old boy seriously hurt.

Before officers could track him down, he ended up at the center of the investigation of the I-279 incident.

On Friday night, Butler City police rushed to Whitmore Avenue, where they found the 17-year-old boy suffering from a serious gunshot wound to the shoulder.

Detectives quickly gathered surveillance video and witness statements and learned the victim was actually shot near Ridge Avenue and New Castle Street. By Saturday morning, they had identified a suspect as Russell of Butler.

But before Butler City police could find him, they found out he was involved in the officer-involved shooting and was killed.

Butler City police stress they were not involved in the chase or the shooting on the Parkway, but do confirm Russell was wanted as a suspect in Friday's shooting of the 17-year-old.

With Devin Russell's death, police say the case is far from closed. They're still looking for witnesses and video of both incidents and urge anyone with information to reach out.