Trying to remove user, the bring them back

System

I had a user who was laid off, then removed from Teamsite, and now needs to be added again. I want to use their original username.

I deleted the user from Windows 2000, then ran "iwuser -d duluth\testuser". I then tried "iwuser -c duluth\testuser" to see if it's been deleted correctly but it comes back with "ERROR - unable to add entry to database: Item already exists"

What am I doing wrong? How do I delete, then recreate the same user later.