Police said Islan Nettles, 21, was taken off of life support after being attacked on early Saturday.
Christina Gonzalez and Matthew Swaye were arrested last week and charged with disorderly conduct.
Blacks made up 61 percent of the more than 17,000 people stopped and frisked in East Harlem in 2011.
Inspector Rodney Harrison said lack of cooperation from residents has stopped him from making arrests.
A dognapped Rottweiler is safe at home after two pooch-pinchers stole her from a grocery store.
Police said three suspects beat a 67-year-old man and robbed him on West 141st Street and Lenox Avenue last week.
Police charged Leonard Arzu, 45, with assault after he allegedly threw his mother, Betty Arzu, 63, to the ground.
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