S.C. Code Ann. § 9-8-100

Should a member cease to be a member of the System, for reasons other than death or retirement, he shall be paid promptly as feasible after his request, but in no event later than six months after the request, the amount of his accumulated contributions as of the date of payment. Should he die before payment has been made, his accumulated contributions shall be paid to his estate or to such person as he shall have nominated by written designation filed with the Board.