You can edit /etc/init.d/halt...look for the do_stop function and enter your kill command as the first line under the function. Not recommended as it might get wiped out when you do an update but that's the only solution I could get for running stuff before shutdown...jaribu and let me know.
@stephen, I also thought that the first time I saw the title...lol
For a moment there I thot it was the 'yes' and 'no' constitution campaign - judging from the topic
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