S.C. Code Ann. § 23-13-240

The term of office of any such deputy sheriff shall expire with the term of the sheriff appointing him. But any deputy appointed under this article shall be removed from office by the sheriff and his commission shall stand cancelled, if the president, treasurer or other executive officer of the corporation which requested his appointment shall file with the sheriff a written request that he be removed. And the sheriff at any time in the exercise of his discretion may revoke the commission of any such deputy for any cause whatsoever.