TMDb/NCIS TV NCIS 500th episode shocker: Director Leon Vance is killed off in a stunning twist that changes the series forever. March 25, 2026 AceShowbiz - The CBS hit series NCIS reached a significant milestone by airing its 500th episode on Tuesday, March 24. This landmark installment delivered a stunning twist that left fans reeling, as one of the show's long-standing characters was unexpectedly killed off. In the episode, Rocky Carroll's character, Director Leon Vance, faced intense challenges when the Department of Defense moved to shut down the NCIS team.