This hired gun was a humanoid woman contracted by Darth Nyriss to investigate information related to the attempts to end her life and to eliminate the Sith overlord Scourge. Both she and her associate were killed just outside the perimeter of Darth Nyriss's fortress when they tried to assassinate Lord Scourge.
Back in 3954 Before the Battle of Yavin, a human female soldier of fortune located on the world of Dromund Kaas was employed by Darth Nyriss to pursue a lead concerning the attempts to assassinate her and to slay the Sith Master Scourge. She and her comrade got to Darth Nyriss's base in a flying vehicle, opening fire with the auto-targeting energy weapon at the Sith Lord, who sought cover behind the statue of the Emperor. After seeing that they were turning around to make another attack run, Scourge hurled his laser sword at the speeder, striking the back end. They abandoned the speeder after decapitating the statue of the Emperor and crash landing. She pulled her energy handguns and tried to defend her partner, as he attempted to free his energy longarm from the wreckage.
Scourge jumped over the speeder and executed the male mercenary before he could ready his weapon. She fired another series of shots at Scourge, even injuring him with one shot, as her partner fell. In response Scourge used the Force to push her into one of Nyriss's statues, the impact knocking her blaster from her grasp and leaving her vulnerable for a few moments. As Scourge leaped over the wrecked speeder and raced to her location, she drew her short stun baton as she dropped into a fighting stance. After circling each other, Scourge offered her the chance to live and to collaborate with him if she revealed who had hired her to kill him. She hesitated for a moment as she considered whether to tell him or not, when Nyriss's head of security Murtog and several guards exited the stronghold and shot her to death multiple times.
The female mercenary was first introduced in Drew Karpyshyn's book The Old Republic: Revan, which was published on November 15th, 2011.