Killing off Jadzia Dax (Terry Farrell) at the end of Star Trek: Deep Space Nine season 6 was the series' biggest mistake. Dax was one of DS9's main cast and was introduced in the pilot episode, «Emissary.» Jadzia's shocking death came in DS9's season 6 finale, «Tears of the Prophets,» when she was murdered by the series' greatest Cardassian villain, Gul Dukat (Marc Alaimo), and it was a devastating moment that crescendoed DS9's dark and complex Dominion War storyline. But it was behind-the-scenes tensions between Farrell and Star Trek's studio, Paramount, that led to Jadzia getting axed from DS9 and replaced with Nicole deBoer as Ezri Dax.
Jadzia was Deep Space Nine's popular Science Officer and the closest friend of Captain Benjamin Sisko (Avery Brooks). Although it took a couple of seasons for DS9's writers to truly define Dax, the initially inexperienced Farrell gradually grew into the character, and Jadzia emerged as a highly intelligent, spirited woman beloved by both her crewmates.
Related: Why DS9's Original Ending Would Have Been A Mistake
Worf (Michael Dorn) joining DS9 in season 4 was a boon to Dax, as the Klingon warrior and the Trill scientist quickly sparked a romance that brought out fascinating new sides of both characters. Jadzia married Worf at the start of DS9 season 6 and they looked forward to a happy life together after the Dominion War was over — until Jadzia's senseless murder, which necessitated a huge revamp of the Dax character as DS9 headed towards its ending in season 7.
The full details of why Terry Farrell left Star Trek: Deep Space Nine have not been fully disclosed, but Farrell has her side of the story while the producers and studios have their version of what happened. According to the
Read more on screenrant.com