Probably spending the rest of his days in a padded cell.

That wouldn't make sense. What about Scarecrow, who was also apprehended at the beginning of TDK?

In the novelization of The Dark Knight Rises, it's said that Joker is the sole resident of Arkham Asylum.
That seems a wasteful use of facilities.

In the novelization of The Dark Knight Rises, it's said that Joker is the sole resident of Arkham Asylum.

They probably locked him up in Arkham with 24 hour solitary confinement and advanced security. He probably lost the will to live after Batman dissapeared.
Lose the Game!!!!!!!

I recall he got arrested and that was the last we see of him.
Slipknot and My Little Pony: Friendship Is Magic fan

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All I can say is they must have put him in a more secure jail cell, because before, he had escaped.

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Well, I've been working lately in a comic book fanfic which tells the story of the Joker from this movie. Now I'm releasing the first chapter, which happens during the events of The Dark Knight, but narrated from the Joker's point of view, and If it achieves success I'll tell what happened (in my mind) after the ending
Here's my web with the comic:
https://agentsofchaosblog.wordpress.com/

Wow, it's been a long time since we had a "Wuz teh Jocker ded at the end?" thread.
The future is in the hands of a man who has none.
(As in no future, as opposed to no hands.)