Nebraska Revised Statutes Chapter 32. Elections § 32-560. Elective office; vacancy; when

(1) Resignation of the incumbent;

(2) Death of the incumbent;

(3) Removal of the incumbent from office;

(4) Decision of a competent tribunal declaring the office of the incumbent vacant;

(5) Incumbent ceasing to be a resident of the state, district, county, township, or precinct in which the duties of his or her office are to be exercised or for which he or she may have been elected;

(6) Failure to elect at an election when there is no incumbent to continue in office until his or her successor is elected and qualified;

(7) The candidate who received the highest number of votes is ineligible, disqualified, deceased, or for any other reason unable to assume the office for which he or she was a candidate;

(8) Forfeiture of office as provided by law;

(9) Conviction of a felony or of any public offense involving the violation of the oath of office of the incumbent; or

(10) Incumbent of a high elective office assuming another elective office as provided in subsections (2) through (4) of section 32-604.