Philadelphia Police say 19-year-old Mary Jefferies and a man used a stun gun to zap people as they walked down the street and then robbed them.
They happened in the Fishtown area and date back to August.
Police are still trying to identify the man seen in surveillance video with Jefferies.
The first robbery occurred on August 11, 2013 along the 1200 Leopard Street. The second happened along the 6600 block of Castor Avenue on August 13th. Then on August 20th, the duo allegedly struck again at the intersection of C and Louden Streets.
On August 27th police say the male suspect was alone when he robbed a victim on the 800 block of East Wyoming Avenue. However, investigators believe the female suspect was in a car nearby.
The most recent and most violent incident happened on September 2nd on the 100 block of West Girard Avenue, in which the victim was stabbed.
Anyone with information is urged to contact Philadelphia Police at 215-686-TIPS (8477), text a tip to PPD TIP (773847) or through PhillyPolice.com.
