MILWAUKEE—A passenger in a vehicle that was pulled over for a registration violation shot and wounded a Milwaukee County sheriff’s deputy while running away from the traffic stop early Wednesday, authorities said. The deputy was shot in both arms and his torso, but the wounds were not believed to be life-threatening, Sheriff Earnell Lucas said at a news conference. The deputy had responded as backup after another deputy made the stop, Lucas said. The driver and a passenger ran away, but the driver was arrested after a brief foot chase, the sheriff said. While searching the area, law enforcement officers encountered a man crouched behind a vehicle, gave him some commands, then heard a single gunshot and found the individual was dead of an apparent self-inflicted gunshot wound. Sheriff’s officials say a preliminary investigation suggests that the man was responsible for shooting the deputy. No officers fired their weapons during …