NCIS has made a lot of changes to its cast over show’s 23 seasons.

Many of the fan-favorite actors are still part of the show, including David McCallum‘s Dr. Donald “Ducky” Mallard, however, there are several of stars who have left the show over the years.

We’re taking a deep dive into just why the actors left the show, and some of the reasons include boredom, the insane working schedule, and more.

New episodes of NCIS air on Mondays at 9pm ET on CBS.

Head inside to find out the reasons why all the main characters from NCIS left the show…

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