I didn't find anything more than what you found. I looked using Ancestry and FamilySearch. I'm assuming the Franks-Draper_May 2010 family tree in Ancestry if yours.
I'd post this query on the Oklahoma Message Board looking for Elizabeth's death. Maybe you already did so. I didn't check.
I'd try to get a copy of John's obituary too.
By the way, the reply notification feature doesn't work on GenForum. I doubt that Ancestry will fix it. You might want to add your email address to your profile so you can be contacted directly. Successful Searching!