An elderly woman was treated and released for injuries she received after she was knocked to the ground by two purse snatchers at a Walmart in Rockwall. Shortly after the incident, the suspects were observed using the victim’s credit card and police arrested 34-year-old David E. Heffner and 29-year-old Jessie James Caston, Jr., of Garland. Each is charged with first-degree felony aggravated robbery of an elderly person and both received a $100,000 bond.