BUFFALO, N.Y. — Federal prosecutors will seek the death penalty against a white supremacist who killed 10 Black people at a Buffalo supermarket, they said in a court filing Friday.

       Payton Gendron, 20, is already serving a sentence of life in prison with no chance of parole after he pleaded guilty to state charges of murder and hate-motivated domestic terrorism in the 2022 attack.

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       New York does not have capital punishment, but the Justice Department had the option of seeking the death penalty in a separate federal hate crimes case. Gendron had promised to plead guilty in that case if prosecutors agreed not to seek the death penalty.