How do i completely delete my facebook account for good instead of only deactivating it?

A person keeps hacking the facebook accounts and composing #$%ed up &% to be able to my gf pretending they are me.how do you go above just deactivating that and just completely erase my fb account.

http://www.wikihow.com/Permanently-Delete-a-Facebook-Account

This guidebook will show you how for you to delete the account on Facebook:

http://romcartridge.blogspot.com/2010/04/how-to-delete-facebook-account.html

All the best!