Leap of Faith

When a Navy Lieutenant who worked at the Pentagon as an intelligence officer attempts to commit suicide by jumping off a rooftop, NCIS is called in to consult the officer. After Gibbs is able to persuade the officer to step down from the ledge, the officer is shot dead, falling to his death from the rooftop. Each member of Gibbs' team has a different theory on the murder, one of which includes the officer being a mole.