- Acting for Two: Michael O'Keefe plays both Cally Lonegan and his twin brother Donald.
http://tvtropes.org/pmwiki/pmwiki.php/Trivia/LawAndOrderS11E21BrothersKeeper
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http://tvtropes.org/pmwiki/pmwiki.php/Trivia/LawAndOrderS11E21BrothersKeeper
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