South Dakota Codified Laws
Chapter 02 - Rights And Obligations Of Marriage
Section 25-2-22 - Enforcement--Void marriage.

25-2-22. Enforcement--Void marriage.
If a marriage is determined to be void, an agreement that would otherwise have been a premarital agreement is enforceable only to the extent necessary to avoid an inequitable result.

Source: SL 1989, ch 216, ยง7.