A 13-year-old black boy was fatally shot by a white Ohio police officer after pulling out a real-looking pellet gun during a confrontation, police said.
Tyre King was shot in a confrontation in an alley on Wednesday night after he and another male ran from officers investigating a reported armed robbery involving $10 in Columbus.
Police said he pulled a gun from his waistband - later found to be a BB gun - and was shot repeatedly. He died later in hospital.
In a recorded 911 call, the robbery victim said he was not going to make a "big deal" after being robbed of $10 but that other witnesses called to report what happened.
Sirens are heard moments later as police search for the suspects.
Then an unidentified witness overhears gunfire and tells a dispatcher: "He's shooting him! Oh, my God!"
No one else was hurt.
It later emerged that Bryan Mason, the Ohio policeman involved in the shooting, had also shot and killed a man in 2012, according to reports.
Officer Mason is a nine-year veteran of the Columbus police.
In the December 2012 case, Mason shot a man who was holding another at gunpoint.
Officers said the armed man refused orders to drop his weapon and was shot.
The Columbus Dispatch reported that investigators concluded Mason acted within policy in that case.
A lawyer for Tyre's family called for a fair and independent investigation into his death.
Sean Walton emphasised that Tyre did not have any violent criminal history.
Mr Walton said the family believed Tyre being involved in an armed robbery would be "so out of character" for him.
He said the eighth-grader played football - who was small for his age - was in the young scholars program at school.
Police chief Kim Jacobs said after the shooting is investigated, a grand jury will consider whether charges are merited.