If a vacancy occurs within ninety days of the next general election, the special election to fill the vacancy shall be held concurrently with the general election to be held two years later.
S.D. Codified Laws § 12-11-7
Vacancy within ninety days of general election--Concurrent elections
Source: SL 1979, ch 99, § 4.
Official source: South Dakota Legislature. Reproduced from public-domain South Dakota statutes; confirm against the official source for the current text. Not legal advice.