Nope. No body seen = no body. Otherwise logically it would make for a very tear jerking funeral service amongst Michel's friends. Even Gilliam got one. Ergo, no body = MIA = still alive. And besides, officially Alto and co. are secretly in SMS because they are still students, so Michel deserves a civilian gravestone.
Oh ye of lil faith. Nothing disproves that he is still alive either. No body, no death.