An Arkansas man who the police say became lost while driving in Chicago was shot and killed early Thursday, apparently by a man he had just asked for directions. The police said the man, Robert Franklin, 55, of Blytheville, Ark., was with a friend in a car about 3:45 a.m. when a man whom he had asked for directions climbed into the back seat and pulled out a gun. Officer Jose Estrada said the gunman robbed the men of cash and as he was leaving the car turned and shot Mr. Franklin four times in the back. The police said his friend drove him to a hospital, where he died a short time later. Chicago’s violent crime has been the focus of national attention, particularly last year when the city led the nation in homicides, with more than 500. The police say the majority of violent crime is gang-related.