interesting, should try contacting his estate??
maybe his ex wifes realtor could provide a contact? bottom of the page.
Actress Amy Yasbeck has sold her longtime home in Beverly Hills for $6.55 million, or $55,000 more than the asking price.
www.latimes.com
also, it looks like its not that uncommon of a name, so maybe go to the county clerks office and look at the property record books for his parents name.
also, some realestate history here:
Tex Ritter's House (former) (Google Maps). The country singer and actor lived here from 1968 to 1980. His son, the late John Ritter (of Three's Company fame), owned the home from 1980 to 1984. The home that the Ritters occupied has been razed and replaced by this much larger one featured here...
virtualglobetrotting.com
looks like they did own and live in nashville for some time.
also, a foundation:
www.johnritterfoundation.org