Halsey was a male Roonan Jedi Master who lived during the Clone Wars between the Galactic Republic and the Confederacy of Independent Systems. Alongside his Padawan, the Nautolan Knox, Halsey participated in the Republic's defense of the Temple of Eedit on the planet Devaron. Though the Jedi and their ARF troopers were initially successful in fighting off the Separatist battle droids, the Zabrak Savage Opress, a pupil of Separatist leader Count Dooku, turned the tide of the battle and cut through the Republic defenders. Halsey moved to confront Opress, but his combat skills were insufficient in dealing with the threat, and both he and Knox were killed by the Zabrak assassin. The Jedi's bodies were later recovered and transported to the Jedi Temple on the planet Coruscant. Separatist Weequa