Pittsburgh Police responded to a Shotspotter alert for the 2700 block of Stafford Street around 1:30 p.m.
When officers arrived, they discovered a male victim with a gunshot wound to the head.
Medics transported the victim to a local hospital in critical condition, where he was pronounced deceased.
There were no other injuries on scene. GVI and the Mobile Crime Unit arrived to process the scene.
The investigation is ongoing.