Watch a sneak peek of the new episode of NCIS "Double Identity" Season 7 Episode 17 airing Tuesday March 9 (8:00-9:00PM, ET/PT) on the CBS Television Network. Episode Synopsis: The team investigates the shooting of a Marine and uncovers more to more

As is perhaps readily obvious from the title, there's a case of double identity on tonight's episode of NCIS. A Marine gets shot, but it appears that he's either living a double life or else is very playful with the women. Gibbs (Mark Harmo more