Marilyn Manson's ex-girlfriend Rose McGowan has signed on to play legendary B-movie actress SUSAN CABOT in a new biopic. The film, BLACK OASIS, is based on a Premiere magazine article about THE WASP WOMAN star's rise to fame and her bizarre death in 1986. Cabot was killed when her dwarf son TIMOTHY bludgeoned her with a weightlifting bar. He was convicted of involuntary manslaughter.