Law-enforcement authorities heightened their search for suspects or witnesses in the area. Police and the FBI were seen in the area conducting raids Monday afternoon. Homicide Sgt. Bob Wilkins said they were picking up fugitives on warrants to see if they had any information.
In the morning, police stopped a man in a white sedan at 24th and Edgley streets, less than a mile from the shooting. The man was escorted into a police van amid a swarm of officers.
Wilkins said the man was stopped for questioning, but it turned out he did not have information on the shooting.
"We're bringing in a lot of people, receiving a lot of tips," Clark said.
The video shows Walker, 40, a 19-year veteran, walking on the north side of Cecil B. Moore, first on the 1800 block, then on the 1900 block, after he finished his overnight shift at the 22nd District offices at 17th Street and Montgomery Avenue. He was dressed in shorts and a baseball cap and was carrying a backpack. It was shortly before 6 a.m. He was headed to a bus stop to get home.
As he is walking, Walker "keeps looking back" toward the south side of Cecil B. Moore and sees "two suspects trailing him," Clark said.
Soon afterward, in the video, two men are seen walking on the south side of the 1900 block of Cecil B. Moore, following Walker.
From the way Walker was dressed, there is "no reason" to believe the thugs knew he was a police officer, Clark said.
Walker was shot on Cecil B. Moore, near 20th, and was pronounced dead at Hahnemann University Hospital shortly afterward, at 6:23 a.m.
Funeral arrangements were pending Monday.
The reward includes $20,000 from the city (the amount in any homicide), $15,000 from the Fraternal Order of Police Lodge 5, and donations from various unions, law firms, businesses and individuals.
Mayor Nutter, Police Commissioner Charles Ramsey and Clark implored anyone with information to contact the homicide unit at 215-686-3334 or -3335.
- Photographer Alejandro A.
Alvarez contributed to this report.
Contact Julie Shaw at 215-854-2592 or firstname.lastname@example.org. Follow her on Twitter @julieshawphilly.