Have you tried getting Lola Riggs death record. Should have the information you need. I am a bit inclined to think they divorced and she remarried ? Death record can be obtained at Oklahoma State Health Dept.
Pearl Riggs, "Oklahoma, County Marriages, 1891-1959" « Back to search results
name: Leo Appleby titles & terms: Mr event: Marriage event date: 15 Sep 1912 event place: Cleveland, Oklahoma, United States age: 21 race: birth date: estimated birth year: 1891 marriage license or bond date: place of marriage license or bond: father: father's titles & terms: mother: mother's titles & terms: spouse: Pearl Riggs spouse's titles & terms: Miss spouse's age: 18 spouse's estimated birth year: 1894 spouse's father: spouse's father's titles & terms: spouse's mother: spouse's mother's titles & terms: reference number: film number: 2108715 digital folder number: 004533059 image number: 00010 Citing this Record
"Oklahoma, County Marriages, 1891-1959," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VXLY-DPZ : accessed 11 Jan 2013), Leo Appleby and Pearl Riggs, 1912. Learn