In Washington, the body of a subordinate officer is found four months after his murder.
A lieutenant jumps off an aircraft carrier, Tony investigates a ship in Colombia, and Gibbs and Ziva join Tony.
Two cyclists find the body of a female lieutenant commander, and Gibbs and the others investigate.
An ambush in the back alley of a bar leaves one Marine dead and another wounded.
A neighbor discovers the mangled body of a Marine.
After a shower head in Quantico's base house leaks bloody water; Gibbs and the team investigate.
An armed man robs Quantico's credit union and kills a guard.
After hatching an elaborate plan, Tony and Ziva break into a top-secret Navy building.
Tony and McGee make an unsuccessful attempt to track down Lee's man.
A boatswain's mate is killed in a single-car accident, and Gibbs and the team discover evidence of gunshots as well as the victim's beatings.
A detective investigates a double homicide on Christmas Eve in Washington.
Gibbs sends McGee to interrogate a prisoner convicted of murder in two identical cases after an old skeleton is discovered.
A former fiancée stabs a petty cop to death on the pavement, as Gibbs and the team investigate.
Two children find the mutilated body of a Navy captain, and Gibbs and the company look into the matter.
The Gibbs team looks into the death of an 18-year-old Marine who lived in the same neighborhood as him after it was discovered by the Metro Police.
In a trial during which the imposter was convicted and imprisoned as a consequence of one of Tony's investigations, a guy impersonating the identity of Tony dumps the body of a witness against him.
When an NCIS agent gets killed in an execution-style shooting, Gibbs and the team investigate.
Vance, with the help of the Gibbs team, works on solving the murder of a person who used to be a Marine Corps member.
On a naval base in Norfolk, Virginia, a mother finds a gun among her kid's belongings. Meanwhile, Gibbs and the group discover two recent murders along with a trail of previous crimes.
Kort asks Gibbs and the team to help him find a wanted person on the NCIS list.
The police find the body of a retired marine, and Gibbs and the company investigate the matter.
Gibbs and the team search for the killer of a marine. Later on, Gibbs and McGee travel to Los Angeles for a joint assignment with the NCIS Office of Special Projects in LA.
Gibbs and McGee continue to work on their Los Angeles project. Rifkin appears and tampers with the NCIS investigation.
When an ICE client dies during a poker game, Gibbs and the team are called in to investigate, seeking assistance from the FBI and ICE.
Michael passes away shortly after Ziva discovers Tony and him on a floor. Vance, Gibbs, Tony, and Ziva go to Tel Aviv.