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Katherine Marie Helmond is an American film, television and theatre actress and director who is best known for her roles as Jessica Tate on the ABC sitcom Soap from 1977 to 1981, Mona Robinson on the ABC sitcom Who's the Boss? from 1984 to 1992, Doris Sherman on the ABC sitcom Coach from 1996 to 1997, and for her recurring role as Lois Whelan on the CBS sitcom Everybody Loves Raymond from 1996 to 2004.