Cops nabbed the suspected killer they say chased down and stabbed a man in the Bronx on Friday, the NYPD said on Saturday.

Rupert Allen, 54, was slapped with manslaughter and weapons charges in the Friday killing of Anthony Nieves inside the vestibule of his Mott Haven building, according to the NYPD.

Nieves, 40, had been on his way to a check cashing place on Bergen Avenue and East 148th Street around 8 p.m. “and he was apparently chased by an unknown individual and found stabbed” in the midsection, an NYPD spokesman told The Post.