Ariz. Rev. Stat. § 38-822
B. A domestic relations order is not effective against the plan unless the domestic relations order is approved by the plan and qualifies as a plan approved domestic relations order. To qualify as a plan approved domestic relations order, a domestic relations order shall comply with any policies or procedures adopted pursuant to subsection K of this section and shall also meet all of the following requirements:
E. Each participant and alternate payee is responsible for maintaining a current mailing address on file with the plan. The plan has no duty to attempt to locate any participant or alternate payee. The plan has no duty to provide a notice of receipt or determination or pay benefits by means other than mailing the notice or payments to the participant or alternate payee at the last known address that is on file with the plan. If the address of an alternate payee is unknown to the plan, but benefits are payable to the alternate payee pursuant to a plan approved domestic relations order, the plan shall either:
G. If the alternate payee identified in a plan approved domestic relations order predeceases the participant and the plan approved domestic relations order does not otherwise provide for the disposition of the alternate payee's interest, the plan shall pay the alternate payee's portion to the personal representative of the deceased alternate payee pursuant to this subsection. The personal representative is responsible for maintaining a current mailing address on file with the plan. The plan has no duty to attempt to locate any personal representative. The plan is not responsible for making benefit payments to a personal representative until the personal representative has both:
H. If, within thirty days after the date the plan verifies an alternate payee's death, a personal representative does not make demand on the plan for the alternate payee's portion, the plan shall either:
2. Remit the alternate payee's portion to the participant, who shall hold the amounts in trust for the estate of the alternate payee until the personal representative is identified. At that time, the participant shall pay the alternate payee's portion paid by the plan to the participant to the personal representative.
Thereafter, the plan shall prospectively pay the alternate payee's portion to the personal representative.