This is another reason why I ONLY rent to anyone on a month to month basis. Either the tenant or the landlord can terminate the rental agreement with a 30 day written notice. When you knew that the tenant was in jail, then you could have posted a no trespassing sign and took a picture of it with that day's newspaper in the picture, and sent a 30 day letter to her.
Also, did you do any screening of your tenant? Apparently not, but I hope you do in the future.
The stranger then would be a trespasser and I would call the law to have him arrested.
Please tell me again why people think leases on houses are a good idea for a landlord. I have seen many reasons on BP that convince me otherwise. They mostly benefit the tenant, it seems.
This reminds me of a guy I met a few years ago that rented mobile homes. He said if he had an issue with a tenant, he would go remove the front door off of the house. He said that the people just moved out every time and his problem was solved. LOL