The stabbing happened less than an hour after and not far from the end of the parade route celebrating the Mount Vernon High School basketball team's undefeated, state championship winning season.
Police responded to the intersection of East Prospect and Gramatan Avenues in Mount Vernon just before 4 p.m. Friday where they found two teenage girls with stab wounds.
One of the victims died on the way to Jacobi Medical Center.
The other victim was treated at Montefiore Mount Vernon Hospital for non-life-threatening injuries.
Police said the suspect was arrested late Friday night after investigators reviewed videos that captured the scene.
The suspect, who is not being named because of their age, faces felony charges of manslaughter and attempted assault.
"This is a terrible tragedy and we mourn the loss of this young life that was taken far too early. Our thoughts are with the victims' families and the entire Mount Vernon community," Westchester County District Attorney Miriam Rocah said. "My Office is working closely with the Mount Vernon Police Department to support the victims' families and investigate this case.
The teen appeared before Mount Vernon City Court Judge Peter Saint George Davis on Saturday and is being head in custody before another court appearance in Westchester County Youth court.
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