SDCL § 2-9-3: Executive board chair and vice chair--Vacancies.

The speaker of the House of Representatives is the chair of the executive board and the president pro tempore of the Senate is the vice chair from the first day of the regular session of the Legislature in an odd-numbered year to the day prior to the first day of the regular session of the Legislature in an even-numbered year, inclusive. The president pro tempore of the Senate is the chair of the executive board and the speaker of the House of Representatives is the vice chair from the first day of the regular session of the Legislature in an even-numbered year to the day prior to the first day of the regular session of the Legislature in an odd-numbered year, inclusive. If a vacancy occurs in the position of speaker of the House of Representatives, the speaker pro tempore shall serve as chair or vice chair of the board, as provided by this section, until the House of Representatives elects a new speaker. If a vacancy occurs in the position of president pro tempore, the majority party caucus shall appoint a Senate member of the board to serve as chair or vice chair of the board, as provided by this section, until the Senate elects a new president pro tempore.