She Played The Mother Of The 3 Girls On "petticoat Junction" 1963-68 But Became Ill From Lung Cancer And Died In 1968 The Show Went On Without Her Her Character Kate Bradley Simply "left Town" Leaving Behind Her 3 Daughters Her Uncle Joe Her Hotel The Shady Rest She Ran. The Show Was Cancelled In 1970 The Addition Of June Lockhart Didn't Help Ratings. But Bea Also Was The Voice Of Betty Rubble In The Flintstones And The Neighbor Blanche In "burns & Allen" She Was On Lucille Ball's Radio Show In The Late 40's Early 50's "my Favorite Husband" And Jethro's Maw Pearl Bodine In The First Season Of "the Beverly Hillbillies"