Understanding all of Gibbs' rules in NCIS and what they mean is essential to knowing Leroy Jethro Gibbs. Mark Harmon played ...

Leroy Jethro Gibbs, played by Mark Harmon, was the heart of NCIS for 19 seasons. He was known for his strict leadership, sharp instincts, and personal set of rules, but behind his tough exterior ...

However, her character in NCIS played a crucial role in Agent Gibbs' (Mark Harmon) storyline. Mouser portrayed Kelly Gibbs, the late daughter of Agent Gibbs, who was murdered by drug lord Pedro ...