109. (1) The mayor or any councillor may resign his seat in the council by transmitting his resignation signed by himself to the secretary-treasurer; the term of office of the mayor or councillor shall expire upon the delivery of the writing to the secretary-treasurer, who shall transmit it to the council at the next sitting.
(2) The death of the mayor or a councillor shall terminate his term of office.
(3) The term of office of the mayor or councillor shall also terminate if he has failed to attend at least three consecutive regular sittings of the council. The regional councillor shall, however, not be deemed to have failed to attend a sitting when absent to discharge his duties in the Regional Government.
(4) Whenever the Court of Québec annuls the election of the mayor or a councillor or a member of the council loses the eligibility or qualification required by law during his tenure of office, such office shall ipso facto become vacant.