Tessa Davies, 47, a leading film set designer who worked on the Oscar-winning production "The Killing Fields," was found bludgeoned to death Wednesday at the home of her companion, police said. They said her body was found at the mansion of television scenery designer Richard Furgerson. Furgerson was found unconscious in another room in the house in Frogmill Spinney, near London. Davies was world-renowned in the film industry. During 1984, she designed the sets for David Puttnam's "The Killing Fields" and was also nominated for an Academy Award for her work with Barbra Streisand in "Yentl." Her latest film, which she had just completed in Mexico, was "Old Gringo," starring Jane Fonda.