If you did and the outlaw fell the door should open. If that's not the case you should try reloading to your last saved point. If it still doesn't work try restarting the game.
If that still doesn't work you've got a serious bug.
If you know someone else with an x-box, strangers wrath and a memory stick you might try copiing a save past that point to your xbox....
good luck anyway, hope I helped you out...
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