Wyo. Stat. Ann. § 15-5-414

Except as may otherwise be provided in any of the options under W.S. 15-5-413, upon the death of a member, inactive member, retired member or individual receiving a survivor's pension, there shall be paid to the designated beneficiary or beneficiaries or, in the absence of a designated beneficiary, to the estate of the member, inactive member, retired member or survivor, a lump sum equal to the excess, if any, of the member's contributions paid from any source without interest over the aggregate of all pension payments made.