When a vacancy occurs in the office of the mayor less than ninety (90) days before the next regular municipal election, the president of the city council shall act as mayor until the next regular municipal election, at which time the registered voters of the city shall elect a person to fill any unexpired term, and until a mayor is elected and qualified for office. If the vacancy in the mayor's office occurs more than ninety (90) days before the next regular municipal election, the acting mayor shall cause a special election to be held for the purpose of electing a mayor for the duration of the unexpired term. The acting mayor shall be entitled to receive the same compensation as the mayor would be entitled to.
Okla. Stat. tit. 11, § 9-111