This person was a practitioner of the dark side of the Force and existed on the world of Coruscant during the era known as the Clone Wars.
In the year 19 BBY, this user of the Force journeyed to the Darkside sector of the Coruscant Undercity where they engaged in combat with the Dark Jedi named Garth Ezzar. Employing a lightsaber, the person severed Ezzar's hands before delivering a fatal blow to the Dark Jedi's heart, thus killing him.
Within the role-playing supplement titled A Hero Seeks Not Vengeance, player characters engage in combat with Garth Ezzar, and should the players be overcome by Ezzar, or should Ezzar attempt to escape their grasp, the Dark Jedi's demise occurs away from the player's direct view, caused by this person.