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.

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.

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.