Mark Harmon beat two Oscar winners to become NCIS’s Leroy Jethro Gibbs, turning the role into a TV legend over 19 seasons.

After almost 20 seasons, Leroy Jethro Gibbs left NCIS. Mark Harmon may have left the show, but this isn't the end for Gibbs.

"NCIS" premiered in 2003, and after over two decades and numerous spin-offs, the show has successfully wrapped up its season ...