article_snippet: In November, Cleveland Officer Timothy Loehmann fired the fatal shots at Tamir within two seconds of arriving outside a recreation center where the sixth-grader was playing with a pellet gun.
article_snippet: Cleveland authorities have repeatedly said that Loehmann mistook Tamir's fake gun for a real one.
article_snippet: Within two seconds of exiting the police car, Loehmann shoots the 12-year-old.
article_snippet: he also showed "dangerous loss of composure during live range training" and an "inability to manage personal stress," the Cuyahoga County Sheriff's Department said.
highlights_snippet: A police officer killed Tamir, 12, last year as the boy played with a pellet gun .
  
highlights_snippet: Officers mistook fake gun for a real one, Cleveland Police Department has said .