NCIS Season 4 Episode 18

Marine Corporal Liam Ryan O'Neill, communications specialist in a field hospital in Bagdad on leave, was found dead, frozen in a snow drift in a park. When Duckie prepares for his autopsy, he awakes, but goes on a ventilator in possibly terminal condition; he was held down violently by the head. Liam's car, jacket and wallet are found, not robbed; a restaurant ticket proves he made a private trip back to Bagdad, allegedly to visit a shot unit comrade; the pilot, Nick Taylor, noticed suspicious armed men awaited him at the airport. In hospital Liam is visited by Gibbs' acquaintance NIS Agent Mike Franks, who says to be Liam's father, but came too late to find out why Liam needed help, yet his prints are found in the car. There is also a trail to loan shark Jimmy Shaloub, who says he refused to lend Liam $25,000. Then someone kills Nick Taylor and three of his fright carrier Fast Flight's illegal passengers, all criminals...