Actress/dancer Yvonne Craig has passed away at age 78, following a battle with breast cancer. Her official site has her obituary. Of course, she will always be known for playing Batgirl in the Batman TV series, but she was also a dancer (as shown by her role as the Orion slave girl Marta in Star Trek) and a lovely person who made many appearances at conventions over the years. Reading her obituary makes it clear that she lived a very full life.
She was also very beautiful, as her many 60s pin-up shots show. More of her life can be read here.