Relatives have said Wright was taking a break from helping his grandmother wash windows when a group of men attacked him on Saturday outside the Baruch Houses in lower Manhattan.
He was stabbed in the neck and died Sunday at a hospital.
The family says it was a case of mistaken identity.
Police on Tuesday said the killing may have stemmed from a dispute between Wright and a 20-year-old man who has been arrested on a murder charge.
Relatives say Wright cared for a younger brother with Down syndrome.
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