Nyheem Wright is believed to have been stabbed in the torso after standing up for the girl on Jan. 20.
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He was chased down by multiple teenage boys, believed to be members of the same street crew, and stabbed by one of them. He died the next day.
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The three turned themselves in to the 60th Precinct Sunday afternoon, and following conferral with the district attorneys office, the 13-year-old was charged with murder.
The 14-year-old and 15-year-old, who were not charged with the murder, have previous arrests for multiple felonies, including involving guns.
They were both charged with assault and gang assault.
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RELATED | Mother demands justice after one of nine sons fatally stabbed
Mother demands justice after one of nine sons fatally stabbed in Coney Island
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