Denise Crosby's Lt. Tasha Yar was always one of my favorite characters on Star Trek: The Next Generation, and I am always happy to see her in the series finale, "All Good Things..." Lt. Tasha Yar was the Chief of Security and Tactical Officer on the USS Enterprise during the first season of TNG, until she was killed by Armus (Ron Gans & Mart McChesney) on Vagra II. Lt. Yar's death was one of the earliest and most jarring deaths in The Next Generation, and the aftereffects of her violent demise were felt throughout the show.