The woman being sought is 18-year-old Monique Robinson of West Bridge Street in Phoenixville.
Police describe Robinson as a black female with light complexion, standing 5'3" tall and weighing 155 pounds.
She is wanted in connection with the murder of Selvin Mamerto Lopez-Mauricio in the early morning hours of September 14th in the 100 block of Prospect Street.
Anyone with information is asked to call The Citizens Crime Commission at 215-546-TIPS. Callers can remain anonymous.
Saleem Williams of Sharon Hill and Stephen Reidler of Lindfield were previously arrested in this case.