If in fact they didn't call for a doctor, then there would be no pronouncement of death, hence, the need for a diversion. We had a similar situation last year over Eastern Siberia. We had called for a doctor but no one had come forward. However, once we began the process of deciding our diversion point and warned our crew, suddenly a doctor appeared and made the pronouncement that our passenger had passed away (there is far more to this story than I am prepared to go into, but you get the gist). We decided to continue to destination versus diverting to a Russian outpost.