The mayor also warned against any more vigilante action.
"If you have information, call 911 immediately. Do not try to take any action on your own. That's what law enforcement is about," he said.
Police said today that DNA tests determined that the murder of 27-year-old Casey Mahoney is connected to the strangler. Her body was found in a wooded area on Dec. 15. She was nude from the waist down. Police said that she had been sexually assaulted.
DNA testing had already connected two other murders to the strangler. Elaine Goldberg was found dead on Nov. 3. Nicole Piacentini was found dead Nov. 13. Both had been beaten, sexually assaulted and strangled.
In early October, a 30-year-old woman was choked to the point of unconsciousness in the same spot where Piacentini's body was found. She was the first to help police generate a sketch of the man.
Police said the strangler may have assaulted two other women who survived. Surviving victims have described the suspect as a soft spoken man.
He told one of the victims that his name is Anthony, ABC station WPVI-TV in Philadelphia reported.
Police have taken DNA swabs of 154 people in the neighborhood and so far 45 of them have been cleared.