A vacancy is created when any of the following events occurs before the expiration of the term of the incumbent: (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.