“NCIS Season 21 bids a poignant farewell to Ducky Mallard, the show’s original medical examiner. While Mark Harmon’s absence is notable, Leroy Jethro Gibbs plays a significant role in the emotional tribute. David McCallum’s portrayal of Ducky, known for his wealth of knowledge and expertise, evolved over time to accommodate the actor’s personal request for more family time. Transitioning to the role of the organization’s historian allowed Ducky to remain a central figure in the series without the strain of long filming days. As the last original character remaining, Ducky’s departure in the wake of McCallum’s passing marks the end of an era for NCIS. In “The Stories We Leave Behind,” the team solves Ducky’s final case, offering closure and reflection. While fans may have hoped for Harmon’s return as Gibbs, the tribute episode serves as a fitting tribute to both Ducky and McCallum’s enduring contributions to the show.”