Entertainment News // 5 years ago 'Who's the Boss?' star Katherine Helmond dies at 89 Katherine Helmond, who played the sassy, no-nonsense matriarch on "Who's the Boss?," died at her home in Los ...

Also appearing was Angela's feisty mother Mona Robinson (Katherine Helmond), who proved so popular that a spin-off sitcom focused on the Mona character was in the works (but did not move forward).

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