From the Hollywood Reporter:
Katherine Helmond, the seven-time Emmy-nominated Texas actress who played the feisty, man-crazy mother Mona Robinson on the long-running ABC sitcom Who’s the Boss?, has died. She was 89.
Helmond, who earlier starred as the wide-eyed socialite sister Jessica Tate on another popular ABC comedy, Susan Harris’ daytime-serial spoof Soap, died Saturday of complications from Alzheimer’s disease at her home in Los Angeles.
The shapely, blue-eyed Helmond also portrayed Lois Whelan, the upper-class mother of Patricia Heaton’s character, on CBS’ Everybody Loves Raymond.