Pittsburgh Police responded to the 7500 block of Hamilton Avenue around 4 a.m. for a report of shots fired.
When Zone 5 officers arrived, they located a female with a gunshot to the head.
SWAT responded, conducted a search of the home, and located two additional victims.
Medics pronounced all three deceased at the scene.
Two victims are female, and the third is male. Their ages are not known at this time.
The Mobile Crime Unit and Homicide detectives will process the scene.
The investigation is ongoing.