South Dakota Codified Laws
Chapter 30 - Emergency Interim Succession To Office
Section 1-30-4 - Exercise of powers by emergency successor to state office--Termination of powers.

1-30-4. Exercise of powers by emergency successor to state office--Termination of powers.
In the event that any state officer is unavailable following an attack, and in the event his deputy, if any, is also unavailable, the said powers of his office shall be exercised and the said duties of his office shall be discharged by his designated emergency interim successors in the order specified. Such emergency interim successors shall exercise said powers and discharge said duties only until such time as the Governor under the Constitution or authority other than this chapter (or other official authorized under the Constitution or this chapter to exercise the powers and discharge the duties of the office of Governor) may, where a vacancy exists, appoint a successor to fill the vacancy or until a successor is otherwise appointed, or elected and qualified as provided by law; or an officer (or his deputy or a preceding named emergency interim successor) becomes available to exercise or resume the exercise of the powers and discharge the duties of his office.

Source: SL 1961, ch 285, ยง4.