Section 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. Created 1972 Ky. Acts ch. 168, sec. 3, effective 6/16/1972.