S.D. Codified Laws § 53-8-3
Current with legislation signed by the governor on or before 3/6/2024
Where a contract which is required by law to be in writing is prevented from being put into writing by the fraud of a party thereto, any other party who is by such fraud led to believe that it is in writing and acts upon such belief to his prejudice may enforce it against the fraudulent party.
SDCL 53-8-3