Koko, who became famous for her ability to learn sign language, was a fan of Mister Rogers' Neighborhood since she was just a baby gorilla. When she appeared on Mister Rogers' show, they immediately became fast friends and she taught him how to sign "I love you." Koko died in her sleep on Tuesday.
TOPICS: Mister Rogers' Neighborhood, Fred Rogers, Koko the Gorilla, Obits