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Jonathan "John" Aprea (born March 4, 1941) is an American actor and comedian, best known for his role as the young Sal Tessio in The Godfather: Part II (1974) and on television as Lucas Castigliano in Another World from 1989 to 1992. In 2006, he appeared in The Heiress. He also portrayed Nick Katsopolis in Full House for 2 seasons. He also co-starred with Lee Horsley in Matt Houston during the 1980s.