A second man, Eric Floyd, 33, is also wanted on a homicide charge, Williams said. A third suspect was fatally shot by police.
Sgt. Steven Liczbinski, a 12-year veteran, was responding to the robbery of a bank inside a grocery store around 11:30 a.m. Saturday. The suspects fled, and opened fire after Liczbinski confronted them a short distance away, authorities said.
About a dozen blue-shirted officers, some wearing white motorcycle helmets, lined both sides of a black hearse and saluted as the married father of three's body, draped with an American flag, was put inside at the hospital Saturday.
The police motorcycles, some bearing black- and blue-striped flags, then escorted the hearse away.
Mayor Michael Nutter on Saturday declared a 30-day period of mourning for Liczbinski and requested that all flags in the city be lowered to half-staff for that period.
Liczbinski's killing comes only a few days after Police Commissioner Charles H. Ramsey announced a major reorganization of the police department's command structure and the addition of nearly 250 officers on street patrols as part of a strategy to reduce crime.
The shooting came about six months after the last death of a Philadelphia officer in the line of duty. Officer Chuck Cassidy, 54, also a father of three, was killed during the botched robbery of a doughnut shop on Oct. 31.
Nearly two years ago, in May 2006, Officer Gary Skerski was fatally shot in the neck when a man robbing a bar fired a shotgun out the back door.