Hi Judy, Both Ruth and her husband died in Orange Co. according to the California Death Index.
They may or may not have lived in Laguna Hills. I think you found that info in the Social Security Death Index but the Soc. Sec. uses that Last Residence field for other purposes.
It's VERY difficult to find an obituary in Orange County because there are MANY towns, cities and newspapers within the County.
You can contact the Orange County Public Libraries, http://egov.ocgov.com/ocgov/OC%20Public%20Librarieshttp://egov.ocgov.com/ocgov/OC%20Public%20Libraries Click on Contact Us link Choose any of the five managers listed Then your request will be sent to the applicable library. I'd tell them they might have lived in Laguna Hills.
Sometimes the cemetery information is included in the obituary.
If the library can't find their obituaries, you can order copies of their death certificates from Orange County, http://egov.ocgov.com/ocgov/Clerk-Recorderhttp://egov.ocgov.com/ocgov/Clerk-Recorder . If the Informant was knowledgeable the Residence field will be filled in. Also the Burial field should be filled in too. They will charge you for a search even if they don't find the death cert. Successful Searching!