Okla. Stat. tit. 19, § 19-449: Incapacity as creating vacancy

In addition to the provisions of law now in force, in all

counties of the State of Oklahoma, where any member of the board of

county commissioners shall become incapacitated physically or

mentally and thereby be unable by reason of such disability to

perform the duties of his office for the remainder of the term to

which such officer was elected, a vacancy in said office is hereby

declared to exist and such vacancy shall be filled by election in

the manner provided by law for the filling of such vacancies;

provided, however, that where such vacancy occurs after the election

and prior to the beginning of the term of the county commissioner-

elect, such county commissioner so elected shall be entitled to

qualify and enter upon the discharge of his duties.