NEW : Judge signs order to exhume the body of Peterson fourth wife . Stacy Peterson has said he believed his third wife left him for another man . Another time , she tried to bring domestic battery charges against Peterson , but no charges were ever filed . Police : Case shifts from a missing persons search to a potential homicide . Friends and family : Drew Peterson 's expressed concerns about her husband .
NEW : Judge signs order to exhume the body of Peterson fourth wife . Stacy Peterson has said he believed his third wife left him for another man . Police : Case shifts from a missing persons search to a potential homicide . Friends and family : Drew Peterson 's expressed concerns about her husband .