O.C.G.A. § 21-2-12

If any such presidential elector shall die, or for any cause fail to attend at the seat of government at the time appointed by law, the presidential electors present shall proceed to choose by voice vote a person of the same political party or body, if any, as such deceased or absent presidential elector, to fill the vacancy occasioned thereby; and immediately after such choice the name of the person so chosen shall be transmitted by the presiding officer of the college to the Governor, who shall immediately cause notice of his or her election in writing to be given to such person. The person so elected, and not the person in whose place he or she shall have been chosen, shall be a presidential elector and shall, with the other presidential electors, perform the duties required of them by the Constitution and laws of the United States.