EXCLUSIVE: NCIS co-star David McCallum has closed a new two-year deal with series producer CBS TV Studios to continue on the long-running CBS procedural. McCallum is one of four original cast members whose contracts are up at the end of this season, along with Michael Weatherly, Pauley Perrette and Sean Murray (who joined during the first season). During the quartet’s previous renegotiation two years ago, McCallum again was the first to reach a new agreement at the end of April. Talks with the other three stretched past the upfronts into June. There is indication of that happening again this year, with Weatherly, Perrette and Murray all in various stages of negotiations. On NCIS, which was recently renewed for a 10th season, McCallum plays medical examiner Donald “Ducky” Mallard. The rest of the cast, including star/executive producer Mark Harmon, have deals in place for next season.