Okla. Stat. tit. 19 § 962
Any county employee who has petitioned the board of trustees for retirement benefits may on his own behalf appeal from the decision of the board. Such appeals shall be made to the district court of such county, and shall be tried de novo by the court without a jury. Such appeal shall be made within thirty (30) days of the date of the decision or order of the board by filing in the office of the court clerk a transcript of the proceedings had before the board, and a copy of all papers filed in such cause, duly certified by the county clerk. Notice of such appeal shall be given in writing by the person appealing at the time of the filing of such appeal in the district court, and such notice shall be served upon the clerk of the retirement board and upon the district attorney.
Okla. Stat. tit. 19, § 962