Highlights from the Fourth Episode of Season 9 of NCIS

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Enemy on the Hill

The NCIS team searches for the person and motive behind a contract killer targeting a Navy Lieutenant Commander on NCIS. Pictured left to right: Jack Conley as Metro Detective Danny Sportelli, Mark Harmon as NCIS Special Agent Leroy Jethro Gibbs and David McCallum as Dr. Donald "Ducky" Mallard