Deadbeat overstaying his welcome Roomate

I'm renting a house in Georgia. I have a guy staying with me. He is not on my lease, he doesn't help with anything - not utilities, rent or food. He was only supposed to be here 2 weeks tops. I've asked him to help with utilities or rent etc. and he refuses. How much notice do I have to give him to get him out? He is costing me too much money to keep around and he has way overstayed what he was supposed to.