I have a tenant who moved in May 9, 2005 for a year's lease. Tenant gave notice this morning that he is moving out because his wife and kids just left him and is suing for divorce, i.e. he will not be able to afford the rent. I know he is liable for the whole year's rent, but what are my rights and what should I do?

Keep his deposit & last month's rent, I hope you have this but if you have not better do this next time. Just get a form called residential lease agreement for your new tenant. Get to work finding a new tenant ASAP, and sue for any rent money you lose by having it vacant that isn't covered by his deposit. Remember, the bank does not accept excuses for nonpayment/breach of contract (no matter how sad or creative) and neither should you. You are running a business, not a charity! If you need the forms for this. There is a site which contains all type of forms. I think it’s ezlandlordforms.com
Hope this helps.