KRS 394.540: Contract to make a will, not to revoke a will or to die intestate.

(1) A contract to make a will or devise, or not to revoke a will or devise or to die

intestate, if executed after June 16, 1972, can be established only by:

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

(b) An express reference in a will to a contract and extrinsic evidence proving the

terms of the contract; or

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

(2) The execution of a joint will or mutual wills gives rise to no presumption of a

contract not to revoke the will or wills.