Adolphus Walker, 25, has been arrested by police in Atlanta, Georgia. Investigators say he fled the Philadelphia area shortly after the robbery.
The other suspects, 28-year-old David Murray and 21-year-old Isaiah Walker are already in custody.
Surveillance cameras captured the crime at the Rite Aid store located at 1315 East Washington Lane at 8:00 p.m. on Sunday, July 10th.
The suspects are seen handcuffing three employees and stealing $3,000 in cash, lottery tickets, cigarettes and cigars prior to fleeing the store.
RELATED: Watch the surveillance video.The employees were not hurt.