Did you actually read someplace that he became Christian, or are you just guessing based on a smudge you saw?
Another recent and famous convert from Judaism is news commentator Robert Novak. It was marvelous to see a recent interview of Novak on EWTN.
The source is a message board at this URL. His conversion is widely known in Catholic circles, as is Larry Kudlow's. I gotta run, so I can't give you more than this.