In this September 10, 2012 photo actors (L-R Leonard Nimoy, Walter Koenig, Nichelle Nichols and George Takei attend Koenig's Walk of Fame ceremony in Hollywood, California. Walter Koenig, the actor best known for his role as Pavel Chekov on the groundbreaking television show "Star Trek" and in the franchise's first seven movies, has died at age 90, his representative said Monday. (Photo by Chris DELMAS / AFP via Getty Images)