Christopher "Chris" Pacci was an NCIS Special Agent stationed at the Naval Yard in Washington D.C who occasionally assisted the NCIS Major Case Response Team led by Leroy Jethro Gibbs. Pacci's career as an NCIS Special Agent came to an abrupt and very tragic end when he was killed in the line of duty in April 2004, leaving the NCIS team and Gibbs completely devastated.