Katherine Marie Helmond (July 5, 1929 – February 23, 2019) was an American actress. Over her five decades of television acting, she was known for her starring role as ditzy matriarch Jessica Tate on the sitcom "Soap" (1977–1981) and her co-starring role as feisty mother Mona Robinson on "Who's the Boss?" (1984–1992). Helmond also appeared in a 1993 episode of "The Upper Hand", the British version of "Who's the Boss?". She also played Doris Sherman on "Coach" and Lois Whelan (the mother of Debra Barone) on "Everybody Loves Raymond". She also appeared as a guest on several talk and variety shows.