The intentional destruction, cancellation, or material alteration of a written contract, by a party entitled to any benefit under it, or with his consent, extinguishes all the executory obligations of the contract in his favor, against parties who do not consent to the act.
Okla. Stat. tit. 15, § 239
Destruction, cancellation or alteration by party entitled to benefit
R.L.1910, § 990.
Official source: Oklahoma Legislature. Reproduced from public-domain Oklahoma statutes; confirm against the official source for the current text. Not legal advice.