Katherine Helmond, affable matriarch of ‘Soap’ and ‘Who’s the Boss?’, dies at 89

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Katherine Helmond, the sitcom star whose memorable roles as ditzy matriarchs in “Soap,” “Who’s the Boss?” and “Coach” endeared her to audiences of all ages, has died. She was 89.

Helmond died Feb. 23 at home in Los Angeles from complications of Alzheimer’s disease, according to her talent agency,…