Tahira Khan

 was second in command of the Valkyrie unit. She accuses Beth Stokes of bringing the Daleks to the planet Bliss. She is delighted with Ace's knowledge of Daleks. When the Daleks advance on the infirmary, she saves Hex from extermination. She is blinded by an explosion, and injured. She died from those injuries before she could find out the real reason for the Daleks being there. (BFA: Enemy of the Daleks)