NCIS just killed off a main character in the 500th episode — and the cast member opened up about how it "was not" their choice to leave the show. During the Tuesday, March 24, episode of the hit CBS

The 500th episode of NCIS gave a shock to fans when a key character made the ultimate sacrifice. After 18 seasons protecting the agency he led, Director Leon Vance died protecting NCIS from being dismantled from within.

CBS's NCIS Season 23 is back this week with its 500th episode. Titled, All Good Things, Episode 13 delves into the aftermath of the unexpected NCIS shutdown.

IF you’re anything like me, you’re still reeling from the latest revelation about Mary Jo. Not only did NCIS: Origins deliver one of the most unexpected but delightful romances, but we had an hour that truly reaffirmed just how integral Mary Jo is to NCIS professionally and personally.

Things are getting extra intense.

Part Two" will release on March 31, and yes, it’s the direct continuation of that life-or-death cliffhanger from Episode 12 where a bomber injured Trigg