Investigators say they are looking to question a man in connection with the crimes, and released a composite sketch in hopes that someone can identify him.
The information came from a possible third victim who was sexually assaulted early last month, police said.
The man is described as either black or Hispanic in his late 20's or early 30's. He is between 5'8" and 6'0" tall. He has a medium complexion and low cut hair.
Anyone with information is asked to call Philadelphia Police at 215-686-3334 or simply dial 911.
Nicole Piacentini, 35, of Port Richmond was the most recent victim. Her body was found Saturday afternoon behind and abandoned building in the 1900 block of East Cumberland Street. Police say her body was partially clothed.
Back on November 3rd, the body of 21-year-old Elaine Goldberg was found in a lot less than a mile away in the 2800 block of Ruth Street. Her body was also partially clothed.