Sometime prior to the 1990s, Hernandez became affiliated with organized crime in his native country of Mexico. He had visibly ceased to be a young man by 1991, suggesting he was born somewhere around the 1950's.
NCIS Season 3
Hernandez appears in flashbacks seen by Leroy Jethro Gibbs in "Hiatus I" and "Hiatus II".
Gibbs' wife, Shannon, was going to testify against Hernandez in court and a federal agent was assigned to protect Shannon and her daughter Kelly. Hernandez fatally shot the agent at long distance while he was driving Shannon and Kelly, killing all three in the crash. Hernandez then returned to Mexico and, according to official NCIS files on the case, was never caught.
NCIS Season 7
NCIS season 8
NCIS Season 9
NCIS Season 13
- Thursday February 14, 1991: Sergeant Tanner - (shot to death).
- Monday February 25, 1991: The car shooting (three fatalities):