Montana Title 7. Local Government § 7-13-2263. Vacancies

(1) death;

(2) a determination pursuant to Title 53, chapter 21, part 1, that the incumbent is mentally ill;

(3) resignation;

(4) removal from office;

(5) neglect or refusal to perform the duties required by this part for 3 consecutive months, except when prevented by sickness or when absent from the district by permission of the board of directors;

(6) conviction of a felony or a violation of official duties; or

(7) the decision of a court declaring the incumbent's election or appointment void.