Gunman identified as Colton Tooley , 19 , of Chicago . Police were checking campus buildings for possible explosives left behind , said Austin Police Chief Art Acevedo . Officials do n't believe there was a second shooter . Students are told to leave . The gunman has died and no one else was hurt .
Gunman identified as Colton Tooley , 19 , of Chicago . Officials do n't believe there was a second shooter . Students are told to leave . The gunman has died and no one else was hurt .