Ever since the show premiered in 2003, Pauley played "Abby Sciuto", who is a forensics expert and an IT-specialist. "Abby" was regarded particularly eccentric and her methods tend to be rather unconventional. Her trademark was the gloomy Gothic style.. Unfortunately, Pauley left the show at the end of season 15!
Special Agent "Caitlin 'Kate' Todd", played by Sasha Alexander was killed in season two by a terrorist, who shot her in the head. She did not only leave behind a shocked NCIS team, but also her devastated fans!