In Sanchez v. State, 242 Ga. App. 686 (530 S.E.2d 775), the Court noted the doctrine of collateral estoppel, which is embraced within the constitutional guarantee against double jeopardy, means simply that when an issue of ultimate fact has once been determined by a valid and final judgment, that issue cannot again be litigated between the same parties in any future lawsuit. The record of the prior proceeding must affirmatively demonstrate that an issue involved in the second trial was definitely determined in the former trial. The possibility that an issue may have been determined in the former trial does not prevent the relitigation of that issue. 242 Ga. App. at 688 (3).