Officials said Tuesday that the other two people injured in the blaze remain in critical condition.
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The apartment went up in flames Sunday afternoon at 565 West 190th Street.
The FDNY said the fire marshal determined a lithium-ion battery sparked the flames in the fourth-floor apartment.
Neighbors said Sunday they were worried about the victims - all four residents were taken to the hospital. All the victims are adults, but one in particular had neighbors very concerned - a 98-year-old woman who has lived in the building for at least 40 years. She is like a grandmother figure to many of the neighbors who grew up with her.
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The names and ages of the victims who died were not yet known.
Firefighters are urging anyone who has lithium-ion batteries in their home to ensure they are using them safely.
The news of the deaths comes as two people -- a woman and a teenager -- were killed in an apartment fire in Brooklyn on Tuesday morning.
In an unrelated fire, a woman died in a fire in the Bronx on Tuesday morning as well.
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