The death of Jadzia Dax in 2374, struck down in the Bajoran shrine on Deep Space 9 by Gul Dukat while he was possessed by a Pah-wraith.
The death of Jadzia Dax occurs in Tears of the Prophets, the last episode of the sixth season of Deep Space Nine. Benjamin Sisko is ordered to lead the invasion of the Chin'toka system. The Prophets warn him not to leave Bajor, but he goes, and Jadzia stays behind in command of the station.
She and Worf have just learned from Julian Bashir that they may be able to have a child, and she goes to the shrine to give thanks. Dukat, who has released a Pah-wraith from an old Bajoran figurine and let it enter his body, beams in and strikes her down with a burst of energy. The spirit then passes into the Orb, and the wormhole vanishes.
Bashir saves the Dax symbiont, which is later joined to Ezri Tigan, but Jadzia dies with Worf at her side. Sisko blames himself and takes leave on Earth. The episode was Terry Farrell's last as a regular member of the cast.