The incident happened at 12:30 p.m., according to police.
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Witnesses told police that the suspect began stabbing the two people over and over again, and their screams echoed throughout the park.
The 23-year-old woman died at Lincoln Hospital.
FDNY says she was stabbed multiple times in the chest.
The man is also at Lincoln Hospital recovering from a stab wound to the arm. He is not likely to die, police said.
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