A Danish inventor accused of killing a Swedish journalist on board his homemade submarine claims she died in an accident before he dumped her body in the sea, Danish police say.The headless torso of a woman found floating in Danish waters could be that of a Swedish journalist who authorities believe died aboard an inventor's homemade submarine, police said Tuesday. In a grisly case that has captured public imagination in both countries, Danish inventor Peter Madsen has been accused of the negligent manslaughter of Kim Wall.