Waite, who lived in the Palm Springs area, died at midday, manager Alan Mills said. Mills, who did not know the cause of death, said he was taken aback because Waite had been in good health and still working.
Waite appeared last year in episodes of the series "NCIS," in which he played the dad of star Mark Harmon's character. He also appeared in "Bones" and "Days of Our Lives."
"The Waltons," which aired on CBS from 1972 to 1981, starred Waite as John Walton, and Richard Thomas played his oldest son, John-Boy, an aspiring novelist. The gentle family drama was set in the Blue Ridge mountains of Virginia.
His co-stars on Thursday praised both the actor and the man.
"I am devastated to announce the loss of my precious 'papa' Walton, Ralph Waite," said Mary McDonough, who played daughter Erin Walton. "I loved him so much; I know he was so special to all of us. He was like a real father to me. Goodnight Daddy. I love you."
Michael Learned, who played wife Olivia Walton, said she was "devastated" by the death of "a good honest actor and a good honest man."
Good night daddy.......