O.C.G.A. § 9-2-26

When two or more joint contractors, joint and several contractors, or copartners are defendants in the same action and service is perfected on one or more of the contractors or copartners and the officer serving the writ or process returns that the rest are not to be found, the plaintiff may proceed to judgment and execution against the defendants served with process in the same manner as if they were the sole defendants. If any of the defendants die pending the action, his representative may be made a party and the case may proceed to judgment and execution as in other cases against the representatives of deceased persons.