Viewers are curious to know who killed Leroy Jethro Gibbs’ family members in the CBS series, NCIS: Origins. The NCIS spin-off chronicles the early years of young Gibbs in the 1990s when he joined as a special agent at NCIS Camp Pendleton office.

In the December 9 episode titled “Vivo o Muerto,” a case of a missing woman ends up answering some burning questions about Leroy Gibbs' past.

Origins" Episode 9. "NCIS: Origins" revisited Gibbs' revenge against the cartel leader who killed his wife and child, which promises to send shockwaves across Mike Franks' team. Episode 9, titled "Vivo o Muerto,