Michael Weatherly and Pauley Perrette have signed new contracts to return to NCIS next season. Sean Murray has refused to comment on his contract situation, but he is the last veteran cast member in question. Part of me is happy to hear of the returns, but the longer actors stay with a series, the more attached viewers become. Character death/departure is an opportunity to energize a show, as we've seen with Kate Todd and Jenny Shepard.
UPDATE: On June 22, it was reported Murray had signed on for next season.