Mark Harmon and Pam Dawber have been married since ... and Ricky struggled with substance abuse, and they eventually divorced. In 1985, Ricky died in a plane crash and Kristin entered rehab ...

A critical truth about Mark Harmon is that he and his two sisters ... In 1980, Kristin Nelson filed for divorce from Rick Nelson; the acrimonious split was finalized in 1982.

Monday's episode of NCIS served as lead star Mark Harmon's final moments on the show as he is exiting the hit CBS series after portraying Gibbs for 18 seasons. During episode four of season 19 ...