A contract to make a will or devise, to revoke or not to revoke a will or devise, or to die intestate, if executed after January 1, 1981, can be established only by

(1) Provisions of a will stating material provisions of the contract;

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Terms Used In Missouri Laws 474.155

  • Contract: A legal written agreement that becomes binding when signed.
  • Decedent: A deceased person.
  • Devise: To gift property by will.
  • Evidence: Information presented in testimony or in documents that is used to persuade the fact finder (judge or jury) to decide the case for one side or the other.
  • Intestate: Dying without leaving a will.

(2) An express reference in a will to a contract and extrinsic evidence proving the terms of the contract; or

(3) A writing signed by the decedent evidencing the contract.

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The execution of a joint will or mutual wills does not create a presumption of a contract not to revoke the will or wills.