Actress Natascha McElhone is to star in a new movie about a pioneering British doctor - just months after her surgeon husband tragically died from heart -failure.The Californication star is take the lead role in a film chronicling the life of James Miranda Barry - a woman who pretended to be a man in order to qualify as a doctor.McElhone's husband, British plastic surgeon Martin Kelly, suffered a cardiac arrest in May, collapsing on the doorstep of the couple's London home.Heaven and Earth, directed by Oscar-winner Marleen Gorris, will begin filming next year - after McElhone gives birth to her third child with Kelly.