S.C. Code Ann. § 30-5-70: Recording of instrument when affidavit of subscribing witness cannot be procured.

When the affidavit of a subscribing witness cannot be had by reason of the death, insanity or absence from the State of such witness, any such instrument may be recorded upon proof of such fact and of the handwriting of the parties who signed the instrument and of the subscribing witnesses by proper affidavit, the proof in every case to be recorded with the instrument.