Why Every Main Character Left NCIS

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Here is why each main character left NCIS. As one of the longest-running shows on television, NCIS has seen plenty of turnover in its team of special agents. Though some fan favorites make an appearance on NCIS from time to time, other exits have been much more permanent. While most departures from the show were made on a high note, some farewells were less than fond.

NCIS follows the Major Case Response Team of the Naval Criminal Investigative Service — or NCIS — as they work to conduct criminal investigations surrounding the US Navy and Marine Corps. Stationed out of Washington D.C., a rotating cast of special agents, psychologists, forensic specialists, and more work together to solve murders and prevent terrorist plots, both foreign and domestic. The team is led by Special Agent Leroy Jethro Gibbs (Mark Harmon), the NCIS team will stop at nothing to bring the guilty to justice. Beginning in 2003, NCIS has become a staple in the CBSline-up.

Related: NCIS: Why Playing An Autopsy Dead Body Is So Bad

The cast and characters of NCIS are a large part of why the series has become one of the most successful on television. Approaching its 20th season, NCIS is still one of the most-watched scripted television series in history, pulling in millions of viewers every season. Starting as a spin-off of the hit show JAG, NCIS itself has launched several successful spin-offs based throughout the country, including NCIS: LA, NCIS: New Orleans, and NCIS: Hawai'i. While the plots and twists of NCIS have entertained fans for almost two decades, it is the characters that provide the true heart of the show.

Caitlin Todd (Sasha Alexander) was one of the first special agents on the NCIS team. As a former Secret Service Agent on board Air