Pittsburgh Police and EMS responded to the 1000 block of Penn Avenue around 3:30 a.m. for a reported male shot.
When Zone 2 officers arrived, they located a male victim with a gunshot wound to the head.
Medics transported the victim to a local hospital in critical condition. The suspect fled the scene before police arrived.
Witnesses stated they heard two males arguing before the shooting.
The Mobile Crime Unit arrived to process the scene, and the investigation is ongoing.