The season begins in the immediate aftermath of Special Agent Kate Todd’s murder by the terrorist . The opening two-part premiere, "Kill Ari," follows Gibbs’ relentless pursuit of vengeance.
This season starts dropping significant clues about Special Agent Gibbs' history, making the first mentions of his first wife, Shannon , and daughter, Kelly .
NCIS Season 3 , which originally aired from September 2005 to May 2006, is a pivotal chapter in the series that navigates the emotional fallout of a major character's death and introduces long-standing fan favorites.