I cannot remove a page admin (and I didn't add him either)

I manage a facebook page for my company. Facebook shut down an unofficial page but added the admin to our official page. I cannot remove him and I did not add him as an admin (not a FB friend). I need you to remove that admin from our page.

The page is here: http://tinyurl.com/pancheros
It is the page for Panchero's Mexican Grill. Please help!