Brother died and owner of seller financing deal needs paperwork.

[Ronald Black]

My brother dies a couple of years ago.  He had a property he was seller financing.  The property was paid off as far as I know.   The owner just contacted me asking for his final paperwork.  I know my brother did his deal through a Title Company.  Does the Title company take care of this situation or I have to? I was his executor of his estate and when we went through the Probate process which took forever since he owned properties in 2 states, this property wasn't even mentioned since it was already sold and I thought everything was taken care of before he got sick. 

If I have to supply some sort of paid paperwork, can anyone tell me what procedures I have to go through? BTW, the property is in Mercer County, California. I live in Arizona.  Thanks!