like that. we are at the opinion, at least at this point in time we don't have our ballistics back yet, of a belief that the firearm used did belong to robert butler jr.'s father, robert butler senior. it was put away in a closet, in a room and we believe he got access to it when his father left the house for approximately 40 minutes yesterday. >> as we now new york the school's principal was wounded. its assistant principal killed. also dead, the shooter in this case, 17-year-old robert butler. one more disturbing piece to this puzzle, butler had been a student at the omaha school for all of two months. until then, he had lived with his mother a town away in lincoln, nebraska, so what happened? i want to turn now to happen nah picket of cnn affiliate kntv out of omaha, nebraska. >> reporter: the student who shot two of his principals was new to millard south. >> started going to school up