Neb. Rev. Stat. § 30-2353

(a) An individual who is divorced from the decedent or whose marriage to the decedent has been dissolved or annulled by a decree that has become final is not a surviving spouse unless, by virtue of a subsequent marriage, he or she is married to the decedent at the time of death. A decree of separation which does not terminate the status of husband and wife is not a divorce for purposes of this section. (b) For purposes of parts 1, 2, 3, and 4 of this article and of section 30-2412 , a surviving spouse does not include: (1) an individual who obtains or consents to a final decree or judgment of divorce from the decedent or an annulment or dissolution of their marriage, which decree or judgment is not recognized as valid in this state, unless they subsequently participate in a marriage ceremony purporting to marry each to the other, or subsequently live together as man and wife; (2) an individual who, following an invalid decree or judgment of divorce or annulment or dissolution of marriage obtained by the decedent, participates in a marriage ceremony with a third individual; or (3) an individual who was a party to a valid proceeding concluded by an order purporting to terminate all marital property rights against the decedent.