My question involves a roommate in the State of: California
On March 2, 2011 I had a roommate move in. He paid rent for March and a $200 deposit, and signed a month-to-month agreement that stated that either party may terminate this agreement by a 30 day written notice, and that the deposit would be
returned within 14 days. About two weeks late he asked if his girlfriend could move in, I agreed. About a week later they started to fight. I told him that I would not put up this and if it happened again that one of them would be leaving (I did not specify which one). Since then he has come home many times drunk and they have gotten into it. A few days after the April rent was paid, I asked him to turn down his music one afternoon, he came out and told me that we would be leaving at the end of the month (verbally, nothing written).
This past Sunday night he came home drunk about 2:30 AM. At 4:30 AM they were getting into it again and slamming doors. I then told him that he could leave anytime. He packed some things and said that he would be back that afternoon (Monday) to get his things. (There are other domestic things between him & his girlfriend, which I am staying out of). She is getting a restraining order against him, and on Monday night put his clothes boxed up on the patio and told him to come and get them, which he did. He did not return the key, so I changed the lock (as far as I know he doesn't realize this yet). Today he sent another person over wanting his deposit back. I told him when I get the key back I will send him his deposit as a money order via certified mail to his PO box.
I just want to cover myself so I wanted to know if I have or have not handled this appropriately. Any input would me appreciated.

