Ala. Code § 45-35A-54.26: Vacancies in Office.

Whenever any vacancy occurs in the office of any commissioner, by death, resignation, or removal, then his or her successor shall be appointed by the remaining members of the board of commissioners of the city, not more than 30 days from the time such vacancy occurs; otherwise, the vacancy shall be filled by the legislative delegation. Every person who is appointed to the office of commissioner in any such city under this section shall qualify for office as soon as practicable after such appointment and shall be clothed with the duties and responsibilities and powers of such office immediately upon such qualification. He or she shall hold office for the unexpired term of his or her predecessor.