Sources tell Eyewitness News the attacker, a 22-year-old man taken into custody at the scene, was a family member.
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It happened inside an apartment building on Putnam Avenue in Bed-Stuy on Sunday night.
Police say a 79-year-old man was stabbed in the abdomen.
First responders rushed him to the hospital, where he was later pronounced dead.
A 49-year-old man and the young girl were also slashed - they are both in stable condition.
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