WordNet sense 1 (someone who is no longer alive):

deceased, decedent, dead person, dead soul, deceased person

WordNet sense 2 (not present; having left):

away, gone

WordNet sense 3 (not in a specified place physically or mentally):

absent

WordNet sense 4 (well in the past; former):

bygone, foregone, bypast

WordNet sense 5 (earlier than the present time; no longer current):

past

WordNet sense 6 (dead):

asleep, at rest, at peace

WordNet sense 7 (no longer having or seeming to have or expecting to have life):

dead