474.420. If after making a will the testator is divorced, all provisions in the will in favor of the testator's spouse so divorced are thereby revoked but the effect of the revocation shall be the same as if the divorced spouse had died at the time of the divorce. With this exception, no written will, nor any part thereof, can be revoked by any change in the circumstances or condition of the testator.
(L. 1955 p. 385 § 271)
Missouri General Assembly