FAIRFAX, Va.—Authorities in Virginia have positively identified the remains of two women they say were killed by a man they believe is a serial killer who used a shopping cart to transport his victims’ bodies after meeting them on dating sites. Multiple news outlets report that police said DNA analysis confirmed that remains found in a container in Fairfax County on Dec. 15 belong to 29-year-old Cheyenne Brown, of Washington, D.C., and 48-year-old Stephanie Harrison, of Redding, Calif. WHSV-TV reports that Fairfax County Police Chief Keven Davis and Major Ed O’Carroll made the announcement during a news conference Friday evening. Police believe Anthony Robinson, 35, of Washington, D.C., is responsible for the deaths of four women found at two different locations in Virginia. Police arrested Robinson in November and charged him with two counts of murder after finding two bodies in a vacant lot in Harrisonburg. Evidence uncovered after Robinson’s …