Actress Pauley Perrette has announced that she will not return to the hit show NCIS due to her fear of co-star Mark Harmon. Perrette claims that she is "terrified" of Harmon and has nightmares about him attacking her. This follows an incident in 2016 when Harmon's dog allegedly bit a crew member, causing tension on set. Perrette also shared photos of another crew member who was beaten up and in stitches, apparently related to the same incident. Sources claim that the tension was so high that the stars were never scheduled to work on the same days. Perrette left the show in May 2018 after 16 years.