Or . . . leave him in there, go on with your business, and when there's a bad smell, call the exterminator or the health department. Feign surprise.
A while back there was an article about a store demolition and when they cracked open the chimney, there were bones from a guy who disappeared years before. Heckuva way to go.
And how. Jokes aside, I'd never wish that fate on my worst enemy.