They first diagnosed the cause of death as asphyxia. If so, some of the obvious signs must have been present. There are non-specific physical signs used to attribute death to asphyxia. These include visceral congestion via dilation of the venous blood vessels and blood stasis, petechiae, cyanosis and fluidity of the blood. (Petechiae are tiny hemorrhages). If they have ruled it out, then there must be something that made them think it was asphyxia. The resort management claims it wasn't food poisoning. So I'm guessing a heretofore undiagnosed familial food allergy, since others in the family felt ill, too. I'm not a forensic scientist. But I have stayed at a Holiday Inn Express and used to watch Quincy, M.E. and House. Later