Hi Joyce, It's not easy to find an obituary in Orange Co. It's expensive to publish one in the OC Register. Some families don't publish an obituary. There is no central repository of newspapers in this county.
However, the OC Public Libraries do try to find them. Go to their web site egov.ocgov.com/ocgov/OC%20Public%20Libraries/Contact%20Us .
In the middle of the page, click on the South Region Supervisor and provide all the details about him.
The request will be farmed out to the applicable library. Successful Searching!