The slayer or abuser shall be deemed to have predeceased the decedent as to property which would have passed from the decedent or his or her estate to the slayer or abuser under the statutes of descent and distribution or have been acquired by statutory right as surviving spouse or surviving domestic partner or under any agreement made with the decedent under the provisions of RCW
26.16.120 as it now exists or is hereafter amended.