The actual takeaway here is that posters don't actually read what has been already written in this thread and just write what they want to, despite being repetitive.
What Happens To The King After He Is Checkmated?
The mated king is sent to Valhalla where he receives 73 Virgin Queens, then he is returned to the battlefield where he is impaled on a stake in the manner of Vlad the impaler by the remaining pieces of the victorious enemy.
I think he actually gets killed. First he can't move, then some other of his pieces moves (or none of them), then he gets captured/killed. But since that happens always after checkmate, it's just skipped in practice. Since the last "killing move" doesn't require any strategy, it's trivial. Imagine you deliver a checkmate, then you tell your friend: "Now make another move and then I kill your king hahaha" and he tells you "What's the point of making another move, it's clear I already lost, so why would we waste time with me making another useless move just so you can then do what we know will happen? I lost this game, so let's just play another one." It would be no longer a game, but just a humiliation for the oponent, so he would probably refuse to do the humiliating last move. And of course you would refuse to humiliate your friend.
After the game the king and pawn all go into the same box.
This proverb can be taken to be either a reflection of the equality of all men after death, or more usually a comment on social inequalities and their fragility