Question: who killed uatu the watcher?
Answer: As Uatu fought the Mindless Ones, the Exterminatrix and Midas robbed the Watcher's armory. The Orb envied of Uatu's power and shot him. The blast didn't kill Uatu, but as he was unconscious, the Orb removed one of his eyes. Nick Fury went to investigate the event and found Uatu recovering from the attack.