Okla. Stat. tit. 26, § 26-12-119: Incumbents - Irrevocable letter of resignation -

Special elections.

Except as otherwise provided by law, an incumbent in any

elective office for which a vacancy is filled by special election

called by the Governor may file with the Oklahoma Secretary of State

an irrevocable resignation in writing which states that the

resignation will not become effective immediately, but rather will

become effective on some date certain. Upon receipt of the

irrevocable letter of resignation, the Governor shall set the date

for the special election. The person elected at the special

election shall take office on the later of the date of certification

of the results of the special election or the date the resignation

of the incumbent becomes effective and shall serve the remainder of

the unexpired term.