Dating after failed engagement
In the episode "Blowback", when confronting "Goliath" on the plane about "ARES", Gibbs reveals he is a Virgo.
He is an expert sniper, as evidenced in "Hiatus" with flashbacks of him hitting at 1,200 yards a long-distance head shot of his family's murderer, who was driving a moving vehicle, and in "Jeopardy" when he hits a kidnapper with a very swift shot to the forehead taken with his left hand while kneeling inside a car trunk.
In "Truth or Consequences", Gibbs saves his entire team by shooting the leader of a terrorist cell after Di Nozzo and Mc Gee get captured looking for Ziva.
In the episode "Extreme Prejudice", Gibbs goes after Harper Dearing, cornering the terrorist in a home in West Virginia, and when the man is about to use his gun, Gibbs stabs him, killing him.
During the course of season four, he is on an undercover assignment that Director Jenny Shepard leads, the key mission being to find arms dealer La Grenouille by posing as his daughter's boyfriend, but he ends up falling in love with her.
In the episode "Knockout", he reveals that he is not doing well with women and that he is still hurting from his relationship with Jeanne Benoit.
Gibbs leads a Major Case Response Team (MCRT) consisting of field agents Anthony Di Nozzo, Timothy Mc Gee, and Ellie Bishop, supported by forensic scientist Abby Sciuto and medical examiner Dr. In the episode "Bête Noire", Gibbs comes face to face with terrorist Ari Haswari and tries to kill him but fails.
Finding Ari later becomes an obsession for Gibbs after Ari shoots and kills original team member Kate Todd in front of Gibbs and Di Nozzo in the season two finale, "Twilight".
Special Agent Caitlin "Kate" Todd (Sasha Alexander) first appears in the episode "Yankee White".
At the same time, Kate is willing to risk her life for Di Nozzo and admits that life would be considerably less interesting without him around. (Michael Weatherly) is a former homicide detective for the Baltimore, Philadelphia and Peoria Police Departments.
Following Sasha Alexander's decision to leave the show, Todd is killed in the line of duty (at the end of the episode "Twilight") by Ari Haswari, collateral damage in the terrorist's obsession with Gibbs. Like Gibbs, he has limited patience for the scientific method and technical terms.
Di Nozzo is said to have played college basketball, "running the point for Ohio State" according to Abby.
It is mentioned in the season three episode "Kill Ari (Part I)" that he comes from a wealthy family but has been cut off by his father, Anthony Di Nozzo Sr (played by Robert Wagner who in turn was played by Weatherly in a TV movie).
He later travelled to Mexico and murdered the drug dealer responsible, a crime he kept concealed for twenty years.