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Diane Sterling (previously Gibbs and Fornell) was a woman who was the ex-wife of former NCIS Special Agent, Leroy Jethro Gibbs, former FBI Special Agent Tobias Fornell, and Victor Sterling as well as the mother of Emily Fornell.

In addition to that, Diane was also a criminal investigator with the Internal Revenue Service (IRS).

Biography[]

Pre-Series[]

NCIS Season 4[]

In Angel of Death we get a brief glimpse of her.

NCIS Season 9[]

In Devil's Triangle Diane enlists her exes Leroy Jethro Gibbs and Tobias Fornell’s help in finding her kidnapped husband, Victor.

NCIS Season 10[]

In Devil’s Trifecta a seaman attempts to kill FBI Agent Tobias Fornell, only for Fornell to kill his assassin in self-defense which prompts the NCIS Major Case Response Team to come and investigate the crime scene but the team are left stunned when they soon discover that Diane is involved in a separate investigation.

NCIS Season 11[]

In Devil’s Triad Diane and Tobias Fornell are back together, Victor Sterling having left Diane.

NCIS Season 12[]

In Check Diane ambushes Leroy Jethro Gibbs at a crime scene with Rebecca Chase who wants to try and make amends with him for cheating.

At the end of the episode, Diane is lured out to a roof top parking lot where she is then tragically shot and killed by Sergei Mishnev.

Personality[]

Physical Appearance[]

Appearances[]

For a more detailed list, see Diane Sterling/List of Appearances.

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