Eads, one of the show’s few remaining original cast members, has played Nick Stokes since the pilot.
His departure comes after a leave of absence in 2013 following an on-set clash with one of the show’s writers, reportedly over the creative direction of his character. He returned following a temporary suspension, later that season.
The long-running procedural has seen many exits but remained on the CBS schedule: Paul Guilfoyle, who played Captain Jim Brass, left last year after 14 seasons. William Petersen and Gary Dourdan left after season nine. Marg Helgenberger departed after season 12; original cast member Jorja Fox has been both a regular (2000–2007, 2010–present) and recurring (2008–2010) cast member.
Source: Hollywood Reporter