Kirista Gard was a joined Trill in the late 22nd century. Kirista was a soldier, and as a host of the Gard symbiont, had been responsible for tracking and stopping a joined murderer circa 2195. Kirista was the last Gard to have to do so prior to Verjyl Gard in 2285. (DS9 - The Lives of Dax short story: "Allegro Ouroboros in D Minor")