OFFICER MOSES Walker Jr. was the fourth Philadelphia cop to die tragically this year, all since June. The other three:
* July 15: OFFICER MARC BRADY, 32, was off duty and riding his bicycle in East Mount Airy when he was struck by a car driven by Kareem Alleyne, Brady's ex-girlfriend's new boyfriend. Alleyne faces charges of homicide by vehicle and manslaughter. Police say Alleyne intentionally hit Brady's bike. Brady, a father of nine, joined the Police Department in 2004. He was assigned to Police Headquarters.