Can a landlord sue for additional damages beyond a security deposit after 30 days?

Question Details: After giving 2 weeks notice, I moved out of my apartment. Our lease was up and my landlord agreed to talk to my roommates about renewing the lease. I said I would surrender my deposit to them. I signed a new lease, moved, and hadn't thought of it until he contacted me. It is almost 2 months since I have lived there and he is threatening to sue me for damages. Is he allowed to do this? Important Notice