Okla. Stat. tit. 36, § 36-3625: Annulment of liability policies

A. No insurance contract insuring against loss or damage

through legal liability for the bodily injury or death by accident

of any individual, or for damage to the property of any person,

shall be retroactively annulled by any agreement between the insurer

and the insured after the occurrence of any such injury, death, or

damage for which the insured may be liable, and any such attempted

annulment shall be void.

B. The provisions of subsection A of this section shall not

apply to a claim made and reported from a liability insurance policy

unless there is actual notice that a claim or potential claim has

been made against an insured who shall have also reported the claim

or potential claim to the insured's insurer.