S.C. Code Ann. § 22-2-120: Additional jurors at time of trial.

If at the time set for the trial there are not sufficient jurors to proceed because one or more have failed to attend, have not been summoned, or have been excused or disqualified by the court, additional jurors must be selected from the remaining names or in the manner provided in Section 22-2-80 or Section 22-2-100.