posthumously
Concise Oxford English Dictionary © 2008 Oxford University Press:
posthumous /ˈpɒstjʊməs/
▶adjective occurring, awarded, or appearing after the death of the originator.
– derivatives
posthumously adverb.
posthumously adverb.
– origin C17: from L. postumus ‘last’ (superlative from post ‘after’), assoc. in late L. with humus ‘ground’, humare ‘bury’.
'posthumously' also found in these Oxford entries:

