Apparently, her death was rather sudden as she appeared with Maureen McCormick, who played TV daughter Marcia (Marcia, Marcia, Marcia!) on The Brady Bunch from 1969-1974, on Dancing With the Stars.
In later years, Henderson became a spokesman for Wesson cooking oil, displaying her "Wessonality":
She also reprised the Carol Brady character in several TV movies and short-lived series. Apparently, A Very Brady Christmas is on Youtube:
