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.

SPOILER ALERT! This story contains plot points from Monday’s episode of NCIS: Origins on CBS. In the December 9 episode titled "Vivo o Muerto," a case of a missing woman who disappeared after a night of clubbing with a Navy seaman ends up answering some burning questions about Leroy Gibbs’ past.

NCIS: Origins tackled the character Leroy Jethro Gibbs’ (Austin Stowell) act of revenge on the cartel leader who murdered his wife and child. In the show’s ninth episode, named Vivo o Muerto, Leroy’s haunting heartache was exposed as he’s been dealing with the pain of his family’s murder from the beginning of the series.

Many are curious to know why Gibbs, portrayed by Austin Stowell, killed Pedro Hernandez in NCIS: Origins. The latest episode titled “Vivo o Muerto” features a young woman who, after savoring a clubbing night,

NCIS: Origins Season 1, Episode 9, "Vivo o Muerto" finally takes us to the moment where Leroy Jethro Gibbs avenged Shannon and Kelly Gibbs' murder - and surprisingly, that moment is not in the future,

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,

Co-Showrunner David J. North shares the details on the story that 'NCIS' fans have been waiting to see since 'NCIS: Origins' was announced.