18-year-old Keyarra Frisby admitted to stabbing 17-year-old Anita Cotton to death in the parking lot of a Walgreens drugstore in the 4200 block of North Broad Street around 3:45 a.m. on July 5, 2015.
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Police say two groups of girls got into a fight after watching Fourth of July fireworks at Penn's Landing.
A pedestrian found Cotton lying in the pharmacy parking lot and quickly flagged down a patrol car.
Cotton had suffered a stab wound to the neck. Officers rushed her to Einstein Medical Center where she was pronounced dead.
Cotton left behind a young daughter.