If I were you I'd just hide the unwanted users from the KDM login screen. To do that, use Kickoff > System Settings > Login Screen, click on the Users tab and tick the users to exclude from the KDM login screen.
I don't use the KDE edition of SL these days, so I'm not sure if the first of the two user accounts you mentioned is important. Anyway, at your own risk
it would be possible to delete them by launching KUser from the command line:
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$ kdesu kuser
or by using the standard Linux command to remove user accounts (see Linux: Delete / Remove User Account
You'll be able to see in the KUser window what the first account is for, and if it looks important then my advice would be to leave well alone. Just exclude them from the KDM login screen as mentioned.