NEW : Holmes called a university switchboard off hours before he allegedly opened fire . Holmes , last month , is accused of killing 12 people in a theater shooting in Colorado , Aurora , last month . He is charged with murder and attempted murder and faces 12 weapons charges .
NEW : Holmes called a university switchboard nine minutes before he allegedly opened fire . Holmes , 24 , is accused of killing 12 people in a theater shooting in Aurora , Colorado , last month . He is charged with murder and attempted murder and faces two weapons charges .