The woman was found after a possible death was reported at about 9:40 a.m. in the 1700 block of Jefferson Davis Highway, police said. The address is in the Crystal City area. The cause of death was to be determined by the medical examiner’s office, police said. Police identified the woman as Natasha Rivera, 20, of Stafford, Va. They said Rodolfo Rivera, 24, of Stafford was arrested and charged with murder.