Plan Administer's Duty to Verify Marital Status

[Guest wwest]

Participant is getting ready to take distributions from pension plans (DC and DB). Participant's first marriage ended in a Mexican divorce. He cannot verify that the divorce was valid, nor can he locate his first spouse, who initiated the divorce. He has remarried. What fiduciary duties does the Plan Adminstrator have in accepting the validity of the first divorce? How should this be reflected in the plan documents?