Why did Maria Bello really leave “NCIS”? Maria is saying goodbye to Sloane and the rest of the NCIS cast simply because her contract has expired, according to CinemaBlend. Her original agreement was for three years, which would have been seasons 15-17.
Who will replace Sloan on NCIS?
NCIS 2021: Showrunner confirms if season 18 newcomer Zane Holtz is Sloane’s replacement | TV & Radio | Showbiz & TV | Express.co.uk.