Mississippi Code Title 21. Municipalities § 21-29-19

(a) Except as otherwise provided in this article, should a member separate from the service of an employer or should he become a beneficiary or die, he shall thereupon cease to be a member and any prior service and membership service which may be credited to his service account at the time of his separation from the service of the employer shall be forfeited by him. Should such person again become an employee of the same employer within a period of five (5) years following the date of his last separation from the service of such employer, he shall again become a member of the retirement system, if not otherwise by this article prevented, conditioned on his redepositing at time of reemployment, and not afterwards, any part of his accumulated contributions theretofore withdrawn from the employees' savings fund, and any prior service and membership service which may have been credited to him at the time of his separation from service shall be restored to him. However, that in the case of the reemployment of a duty disability retirant neither the limitation of five (5) years nor the redepositing of any sum withdrawn from the employees' savings fund shall apply.

(b) The provisions of subsection (a) shall not apply to any employees of a municipality who are employed after adoption of a resolution in accordance with the provisions of subsection (c) of Section 21-29-17. However, under the provisions of the agreement between the municipality and the public employees' retirement system, after the employee has been actively employed for a period of four (4) years and reported as a member of the public employees' retirement system of Mississippi, he may pay the employee contributions, the employer contributions and interest as determined by the public employees' retirement system of Mississippi based on the earnings during the previous period of service with the municipality and receive creditable service for such prior service in the public employees' retirement system of Mississippi.