ORS 112.315: Revocation by divorce or annulment.

Unless a will evidences a different intent of the testator, the divorce or annulment of the marriage of the testator after the execution of the will revokes all provisions in the will in favor of the former spouse of the testator and any provision in the will naming the former spouse as personal representative, and the effect of the will is the same as though the former spouse did not survive the testator.