Frank Randolph Cady ( September 8 , 1915 -- June 8 , 2012 ) was an American actor best known for his recurring and popular role as storekeeper Sam Drucker in three American television series during the 1960s -- `` Petticoat Junction '' , `` Green Acres '' , and `` The Beverly Hillbillies '' -- and his earlier role as `` Doc Williams '' on `` The Adventures of Ozzie and Harriet '' .
Randolph Cady ( September 8 , 1915 -- June 8 , 2012 ) was an American movie and television actor best known for his recurring and popular role as storekeeper Sam Drucker in three American television series during the 1960s -- `` Petticoat Junction '' , `` Green Acres '' , and `` The Beverly Hillbillies '' .