NCIS S10E09:

Devil's Trifecta

IMDb 7.9 60 min/episodeRelease:2003
A Navy seaman fires on Fornell, who returns fire and kills him; Gibbs and company investigate, along with Fornell and the mutual ex-wife of Gibbs and Fornell. The gang find frozen fish, a dead body, a missing accountant, and two bad guys.