An Arlington, Virginia, man is dead after he tried to stop a sexual assault he witnessed Thursday night. The suspect, who assaulted multiple people and robbed another, is in custody, police say... ...Police said Michael Nash, 27, of Arlington, was walking with a woman when he began to physically and sexually assault her. Patricio Salazar, 54, of Arlington, saw the assault and tried to help the victim. Nash then physically assaulted Salazar and left him unconscious, the police said. Salazar...