Koko the gorilla who mastered sign language, raised kittens and once playfully tried on the glasses of the late actor Robin Williams, has died. She was 46. The Gorilla Foundation says the western ...

Editor's Note: This story was published on Aug. 13, 2014. Koko died in her sleep at the foundation's preserve in California's Santa Cruz mountains on Tuesday, June 19, 2018. Robin Williams brought joy ...