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U.S. Marshals arrest Philadelphia man accused of killing Streets Department worker

Senaaj Jackson was apprehended on the 2400 block of Arlington Street in North Philadelphia, after authorities learned he was visiting a family member at a residence there.

Philadelphia police investigate the scene of a shooting during which a Philadelphia Water Department employee was shot inside a store at 2300 Oakford Street.
Philadelphia police investigate the scene of a shooting during which a Philadelphia Water Department employee was shot inside a store at 2300 Oakford Street.Read moreAlejandro A. Alvarez / Staff Photographer

U.S. Marshals on Wednesday arrested a 22-year-old Philadelphia man who police say killed a Philadelphia Streets department worker last month and had been on the run since.

At about 6:30 a.m. U.S. Marshals arrested Senaaj Jackson on the 2400 block of Arlington Street in North Philadelphia, after learning he was visiting a family member at a residence there, the agency said in a statement. U.S. Marshals surrounded the house, knocked on the door, and arrested Jackson without incident.

Jackson had been on the run since Sept. 7, when police say he shot and killed Masir Williams, 21, a Philadelphia Streets Department worker, at a corner store in South Philadelphia after Williams stopped in for a bottle of water before work.

Williams was shot in the back during an argument inside the store, Philadelphia police said.

Jackson was in police custody awaiting charges and processing. He is expected to be charged with murder, possession of an instrument of crime, reckless endangerment of a person, and related crimes, a spokesperson for the District Attorney’s Office said.

About 8:44 a.m. on Sept. 7, three Streets Department employees, including Williams, arrived at 23rd and Oakford Streets to work in the area, police said. As the crew arrived, Williams got out of the vehicle and went into a corner store to buy water and other items before the start of his day.

While in the store, Williams got into a fight with another man, who pulled out a gun and shot the victim in the back, police said.

Williams was taken to Thomas Jefferson University Hospital, where he was pronounced dead less than two hours later, police said. He had worked for six months at the Streets Department.