What should be the first course of action regarding a death of an incapacitated person whose death and guardians action are questionable ?

The incapacitated person, who had a guardian that was not a relative, died in a nursing home. The medical records indicate said person was found in respiratory distress (specifically not breathing). Although in a compromised state of health for many years this person was not sick immediately before death. The deceased persons body was immediately transferred to a funeral home the same day of death, a medical examination was not performed and the body was cremated the day after death. Family members were not notified of the death or cremation, by the nursing home or the guardian.