S.C. Code Ann. § 9-18-50

The death of the alternate payee terminates any interest the alternate payee has in any retirement system and which is on account of a qualified domestic relations order. Upon proof of death of the alternate payee, the member, retired member, or beneficiary is entitled to receive the full amount of benefits payable in the future to the member, retired member, or beneficiary without reduction for the amount previously paid to the alternate payee.