In the Hobbit story at the battle of five armies, a stone hit Bilbo in head and he faints away while wearing the One Ring. Since he was wearing the ring all the time during the battle, he remained invisible, until he woke up(and the battle was over).
Now, I wonder what would've happened if the strike would've killed Bilbo instead? Would he and the One Ring remain invisible or would they turn visible? What is the difference between fainting and sleeping and passing away?