Iowa Code § 633A.4707: Person causing death.

A person who intentionally and unjustifiably causes or procures the death of another shall not receive any property, benefit, or other interest as a beneficiary of a trust by reason of such death. Any property, benefit, or other interest that such person would have received because of such death shall be distributed as if the person causing the death died before the person whose death was intentionally and unjustifiably caused or procured.