Sunil Williams, 29 of Mount Vernon was charged with second-degree murder in the stabbing. Police released a mug shot of Williams over the weekend after he was arraigned Saturday morning.
Another man also was arrested on separate charges.
The stabbing resulted from an altercation between Williams, Rochester and the third man about 10:30 a.m. in the 600 block of South Street, police said.
Peekskill emergency responders arrived shortly after the stabbing, and the victim was taken to Hudson Valley Hospital Center in Cortlandt Manor, where he was pronounced dead. Williams was found by police shortly after the incident.
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