SDCL § 3-4-1: Events causing vacancy in office.

An office becomes vacant if one of the following events applies to a member of a governing body or elected officer before the expiration of the term of the office; the person:

(1) Dies;

(2) Resigns;

(3) Is removed from office;

(4) Fails to qualify as provided by law;

(5) Ceases to be a resident of the state, district, county, municipality, township, ward, or precinct in which the duties of the office are to be exercised or for which elected;

(6) Is convicted of any infamous crime or of any offense involving a violation of the official oath of the office; or

(7) Has a judgment obtained against the person for a breach of an official bond.