S.D. Codified Laws § 4-5-13
The State Investment Council shall consist of eight voting members. Five members of the council shall be appointed by the Executive Board of the Legislative Research Council and the executive board may appoint persons holding public office, appointive or elective, provided that no more than three members of the State Investment Council, at any one time, shall hold public office. Action shall be by majority vote. Each of the members of the State Investment Council shall be appointed for a term of five years. No more than four appointed members may be members of the same political party. In addition to those members appointed by the executive board, the state treasurer, the commissioner of school and public lands, and the executive director of the South Dakota Retirement System shall serve as ex officio voting members.
SDCL 4-5-13