Neither are included in the Heard Co., Georgia Cemetery book by Lynda Eller.
There is a a William S. Hilley only date 16 March 1889, 60 years old and Martha G. Hilley 16 May 1890 only date age 56 years, Wilfe of W. S. Hilley buried at Bethel Baptist Church in GMD 693 of Heard Co., GA.

That area is near the Coweta Co. border, so I looked in my Coweta Co cemetery book. Not in there, either.

Good Luck!

Valerie Freeman
Tustin, California