Military Service:

5th Ky. Inf. Confederate Army

Co B 5th Ky Mtd Inf CSA.

Also see comments in article Kentucky 5th.
From the book: the 10th Kentucky Cavalry written by John Wells who was the commander of the Eastern Kentucky Brigade of the SCV. Thomas J. South left the 5th Kentucky Infantry and joined Diamonds 10th Cavalry.

Franklin Co, KY Wills
Name                             Date                     Will Written      Date of Probate         Page
SOUTH, Thomas J.     October 25, 1880                        January 27, 1882           57

Thomas Jefferson South is somewhat of a mystery to me. I couldn't find his grave in the Frankfort cemetery.

1880 census: living with sister Elizabeth South Trimble at Forks of Elkhorn, Franklin Co, KY
The death date has not been verified.
According to other information, Thomas never married.