How to kill a villain

I'm changing the atrocious ending of my story and I need some ideas. How would you kill the villain. I don't want my character to be directly responsible for killing him. Something more Disney where the villain basically dooms himself. But how?

Depends on your story. What options does your villain have for self-disposal?

There's always the attempt to murder someone else, gone wrong. Very popular.

Seeing that his plans have been foiled he makes an impulsive, badly-thought-out attempt to kill the good guys which backfires?

Heck, in my first NaNo novel, I had my villain commit suicide. He jumped off a bridge just like Javert in Les Miserables. He ended up not dying, which I reveal in the sequel. But the suicide scene was cool.

google TV tropes. There's also a handy table on this link:

http://en.wikipedia.org/wiki/List_of_James_Bond_villains

If you'll scroll down to the table, you'll see the name of the villain and where he/she appeared (which film or book), their objective (what they want to accomplish), "objective failed" (how their plan went wrong), and in the final column, their "fate" (usually something fatal).

If you work up a similar table for your villain, you can simplify his or her story arc and run through a number of scenarios very quickly.