Pittsburgh Police from Zone 5 responded to a five-round ShotSpotter alert in the 7300 block of Hamilton Ave. at Sterrett St. just after 10:45 p.m.
While en route to the call, officers were notified that a male in his late 40s was struck in the back by gunfire. They located him inside an apartment in the 7300 block of Hamilton.
Medics transported the victim to the hospital in critical condition.
Family members told police the male had stepped out of the house when they heard gunfire. He came back inside and collapsed on the floor.
The Mobile Crime Unit processed evidence at the scene to include shell casings and ballistic damage to a car. There were no witnesses and there is no suspect information at this time.
Violent Crime Unit detectives are investigating.