A Philadelphia police officer Moses Walker Jr., 40 also known as a “turnkey” was gunned down four blocks from his station house Saturday morning.

Walker had declined a lift home from a fellow officer after ending the night shift before 6 a.m. at his Station House in “North Philly,” according to The Philadelphia Inquirer newspaper.

The shooting which took Walker’s life occurred at 6 am with robbery as the apparent motive. He was only four blocks away from the station house in which he worked.

Walker had been shot at least twice in the chest and abdomen, although it was not clear if he returned fire. The officer was still alive when found with the weapon underneath his body.

“Somebody knows who did it. Somebody knows what happened,” Police Commissioner Charles Ramsey said. “They need to come forward.”

The 19-year veteran, who was off-duty and out of uniform, was only months away from being eligible for retirement. He was unmarried but leaves behind a mother and 5 siblings.

Police are asking anyone with information to call 215-686-3334 or 3335.