Just before 12:45 a.m, police from Zone 1 located a female outside on Bidwell Street at Western Avenue with significant head trauma.
She was pronounced deceased at the scene a short time later.
The cause and manner of death will be determined by the Allegheny County Medical Examiner's Office.
The investigation is ongoing.
Tonight, the City-County Building is illuminated to recognize Poison Prevention Week and the 50th Anniversary of "Mr. Yuk" in partnership with Children's Hospital of Pittsburgh of UPMC.
For questions about the lighting at the City-County Building, please reach out to the Office of the Mayor.