Tenant Leaves Middle of Night

[Joel B.]

I had a tenant here in Colorado.  I knew he fell on hard times and filed bankrupcy but did not include rent in that filing.  He said he wanted to stay until lease was up (August) but I felt he was not being straight when rent was past due several days.  I went over to the rental and everything was gone.  No response from him either.  What are my legal obligations in terms of sending him notice on not getting his deposit back either as place was not cleaned, major carpet damage done, damage done to trim, trash left etc....?