That would be the incomparable Cyd Charisse, who passed away at 86. IMHO, she was the fireballer of American cinematic dance... just wham, down the middle, often at 100 m.p.h. or more.
While one can understand NBC's interests in touting the late Tim Russert, who untimely (and most unfortunately) passed away at 58, one does wonder why other media outlets are in full hagiography mode. Danny Schechter comes pretty close to mirroring my own thoughts on Russert. I will just say that Russert had the most intimidating wind-up in the game, after which the ball would invariably cross the middle of the plate at... 45 m.p.h. (except for Cheney, with whom he played T-ball.)