No, not yet. But I hear the investigations continue and I don't believe there's an extradition treaty with the vatican. If they _do_ find anything there's probably no way they can compel him come back here. Or, the Organization can do it's best to spend the Faithful's $$$ to make it difficult.
Law would probably be sent back if he's indicted.
But I'm sure O'Reilly (MA Dem Attorney General) would have already tried if he could - he's gunning for Governor in '06, and prosecuting Law would probably swing it for him.