FAIRFAX, Va.—Police in Virginia say the discovery of four bodies at two different locations in the state are the work of a serial killer who used a shopping cart to transport his victims’ bodies after meeting them on dating sites. At a press conference Friday, Fairfax County Police Chief Kevin Davis dubbed the suspect, 35-year-old Anthony Robinson of Washington, the “shopping cart killer” and said police are working to determine if there are other victims. Davis said Robinson, who was taken into custody in Rockingham County last month, has lived in multiple locations, including New York and Maryland, in recent years. Police in Harrisonburg arrested Robinson last month and charged him with two counts of murder after finding two bodies in a vacant lot in the city. “The good thing is he’s in custody. The challenge that remains is identifying other victims,” Davis said. Evidence uncovered after Robinson’s arrest led …