The teen, whose identity has not been released because of his age, is accused of killing 49-year-old Nelson Mattocks.
Investigators say two young men on a motorized scooter shot and killed Mattocks near a playground on East 156th Street one week ago.
Mattocks was not working at the time.
Police say he was not the intended target of the shooters.
Investigators believe the shooting was gang-related.
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