Manhunt continues, and experts doubt it was a professional hit man
                                
                                
                                    (Newser) -
                                    As the manhunt for a gunman who fatally shot UnitedHealthcare CEO  Brian Thompson  on Wednesday in Manhattan stretches into a third day, other health insurers are taking their own precautions. The  AP  reports that Medica, a health care firm also based in Minnesota, like UnitedHealthcare, is shuttering its half-dozen locations...