LOS ANGELES — June Foray, who provided voices for Rocky the Flying Squirrel and characters in hundreds of classic cartoons, has died at age 99.

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Foray died Wednesday at West Hills Hospital in Los Angeles. Her niece, Robin Thaler, said the cause of death was cardiac arrest, but her aunt had been in fragile health since a car accident two years ago.

Foray was best known as the voice of Bullwinkle’s sidekick Rocky the Flying Squirrel and of their archenemy Natasha Fatale. But she had more than 300 credits as a voice actress, working constantly for companies including Warner Bros. (as one of the voices for Granny in Looney Tunes), Disney and Hanna-Barbera.

She voiced Grandmother Fa in Disney’s “Mulan” and Talky Tina, the murderous doll in a famous “Twilight Zone” episode. She also played Cindy Lou Who in the 1966 Dr. Seuss special, “How the Grinch Stole Christmas!”