Andrew Duggan (John Walton) 1988 at age 64 of throat cancer in Westwood, CA. Edgar Bergen (Grandpa) 1978 age 75 of a heart attack in Las Vegas, NV. Ellen Corby (Grandma) 1999 age 87 natural causes in Woodland Hills, CA. Dorothy Stickney (Miss Emily) 1998 age 101 at her home in NYC.