Okla. Stat. tit. 18, § 18-490: Cancellation of bond - Grounds - Notice

Where any surety company bond is required to be executed by any

county, district, or state officer or his deputy or by any county

employee who has in his custody any money or property belonging to

the county for the purposes of his employment, whether said bond is

required by law or by the board of county commissioners or by the

principal officer, such surety or sureties may, if they deem

themselves unsafe or insecure, upon thirty (30) days written notice

given to the Secretary of State as to state and district officers

and as to county officers the board of county commissioners,

withdraw and cancel their obligations as surety or sureties on said

bond; provided that such cancellation shall not relieve the surety

company from any liability previously incurred, and said pro rata

share of the unearned premium shall be returned.