Dallas Cowboys rookie quarterback Joe Milton III threw his first NFL touchdown pass during a preseason game on Saturday before exiting in the fourth quarter with an apparent injury. The former University of Tennessee signal-caller completed 17 of 29 attempts for 143 yards, one touchdown and one interception. Milton is competing for the backup role behind starter Dak Prescott. The Cowboys did not immediately provide details on the nature or severity of the injury, and no timetable for further evaluation was announced.