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In Rock Creek Park, Washington, DC, a ranger hears gunfire and sees an injured man, who, identified by a thumbprint, is a Marine first lieutenant who became MiA in Afghanistan while on a recon mission six years before; Gibbs and company investigate. The gang talk with the two other Marines on that mission, and McGee and Ziva notice something curious, then a second wife with a different surname shows up. McGee learns that a PI has checked out the victim, so Ziva meets the PI and finds out who hired him. The victim dies of heart failure while in the ICU. Ducky finds an inconsistency. The gang continue to dig, and they eventually find all the pieces and put them together, then they arrest the shooter. Abby becomes a mommy in charge of a special critter with a special future. Sophie dislikes bow ties.