Mark Harmon's departure from NCIS after 19 seasons has disappointed fans, but his former co-stars reportedly feel let down by his lack of enthusiasm to return. Harmon left to "keep his career fresh" but showrunner Steven D. Binder has expressed interest in bringing back his character. However, Harmon's indecisiveness and focus on other projects have frustrated his co-stars, who had hoped his return would boost the show's popularity. Although there is speculation, neither Harmon nor the network have confirmed his return. NCIS has been renewed for a 21st season.