The victim, 21-year-old Islan Nettles, died yesterday, five days after she was attacked. The medical examiner's office will determine a cause of death.
It was the latest in a spate of bias attacks this year in New York. Sixty-eight have been reported, from yelled slurs to the May killing of a 32-year-old gay man in Greenwich Village. Police stepped up patrols this summer in response.
Last year, 54 attacks total were reported. Nettles and a friend, another transgender woman, were out Saturday evening in Harlem when they ran into a group of men, and one pounced, punching Nettles in the face, police said.
After the attack, Nettles was hospitalised, slipped into a coma and later died.
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The witness eventually told detectives about the anti-gay remarks, and the hate crimes task force took over the investigation. Detectives are looking at whether the suspect had propositioned Nettles. Upgraded charges are possible following the medical examiner's ruling, police said.
In May, police said Mark Carson, 32, was first taunted with homophobic slurs, then shot in the head in Greenwich Village, not far from the site of 1969 Stonewall riots that helped give rise to the gay rights movement.
Some of the other bias incidents this summer included an assault last week where two men were attacked in Chelsea.