The only marriage that I could find that was even close is as follows:
George T. Walker to Georgia E. Johnston 15 Feb 1866 in Telfair
The 1870 census indicates that Georgia was probably on 2 years younger than Thomas, so she would have been born in 1846, this fits better with the marriage date. The 1900 census lists Thomas as George. Marriage year given for George and Georgia is 1865. Georgia is listed as born Jan 1848.
Couldn't find a death date for Georgia E.at least not for Telfair/Dodge. She may have died in a nearby county.