Note, all the steps must be done in single-user mode (hold down cmd-s during boot).
Delete the user home directory
$ mount -uw / $ rm -R /Users/<username>
Delete the user from Directory Services
$ cd /System/Library/LaunchDaemons $ /bin/launchctl load com.apple.DirectoryServices.plist $ dscl . -delete /Groups/admin GroupMembership <username> $ dscl . -delete /Users/<username>
Remove .AppleSetupDone to cause Setup Assistant to run
$ rm -rf /var/db/.AppleSetupDone
Once the final step has completed, you can shutdown the computer using the command below and then boot from another HD and image if necessary using Disk Utility.
$ shutdown -h now
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