New York City Police officers arrested a Bronx woman on Tuesday for fatally stabbing her boyfriend.

Authorities said Justine Dorsey, 24, grabbed a knife during a fight with her 51-year-old boyfriend before she stabbed him to death while in their Morrisania apartment early Saturday morning.

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At around 1 a.m., investigators found Dorsey's boyfriend — identified as Theron Hamilton — bleeding on the floor of the apartment on East 169th Street with a stab wound to his chest.

Paramedics rushed Hamilton to Lincoln Medical Center, but he died soon after they arrived.

Police said it took three days to track down Dorsey, who authorities found on Monday.