Tenant abandoned apt. 2 mo's into a 1 yr. lease without notice. I have no idea where he is now. Owed loan also

I rent the downstairs apt. of my home. I took in a tenant upstairs with me. He had just moved here and was job hunting. He signed a loan agreement with me for back rent and personal loans. When he found work, he moved into the downstairs apt. and signed a one year lease from May 1, 2008 until April 30, 2009. He paid rent for May and June. I had to go out of town on June 26-June 30. When I returned, the keys were in the unlocked door to his apt. and his dumpy furniture was there and the apt. was left a mess! I depend on the rental income to make ends meet. Paying the security dep. of 1 mos. rent was also due on 7/1! I want to swere out a warrant but have no address for him. I feel that he is responsible for the sec. dep. and 10 mos. of rent in addition to a written loan agreement signed by both of us for $3200 for back rent upstairs and personal loans until he found work. His employer tells me he quit the job 3 wks. ago. He had not told me of course. Please help! What recourse???