(a) If a member names more than one beneficiary for a lump-sum death benefit, the pension system shall divide the benefit equally among the named beneficiaries or, if the member has designated a proportional division, each beneficiary is entitled to the proportion designated.
(b) Except as provided by Subsection (a), lump-sum death benefits are subject to the laws of descent and distribution if the decedent has not provided for testamentary disposition.