Synonyms for Deceased (same or very similar meaning)
WordNet sense 1 (someone who is no longer alive):
decedent, departed, dead person, dead soul, deceased personWordNet sense 2 (dead):
gone, asleep, at rest, at peaceWordNet sense 3 (no longer having or seeming to have or expecting to have life):
deadFrom the ODE community, based on WordNetadd/edit