The woman was leaving the Lucky Seafood Ranch Market on La Sierra Avenue around 1:25 p.m. Monday when two men asked for some change. They pulled out a gun and took her wallet.
On Thursday, police arrested 21-year-old Domonic Odel Adams, who was the one with the handgun. The second suspect remains at large.
Anyone with information on the robbery was asked to contact detectives at (951) 353-7138 or (951) 353-7137.