Need a spider ID!

Found this guy/gal while on evacuation from Hurricane Katrina inside a campground in Coushatta, Louisiana. He is wrapping up his freshly killed daddy longlegs in both pictures. The web was about 5 feet long and 2 1/2 feet wide. The spider himself was probably 2 1/2 inches long and 1 1/2 inches ide if he was stretched out. I have no idea what kind of spider this is and would appreciate any help