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Louie Messer is the brother of CSI: NY's Danny Messer. He has been involved with a local gang called the Tanglewood Boys in the past. Louie was played by Larry Romano who is, coincidentally the cousin of Carmine Giovinazzo (Danny Messer).
Danny Messer (Brother) Lindsay Messer (Sister-in-law) Lucy Messer (Niece via Lindsay and Danny) Niece or Nephew (Currently expecting via Lindsay and Danny)