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 Feb. 23 of complications from Alzheimer’s disease at her home in Los Angeles, her talent agency, APA, announced.