Wis. Stat. § 62.65
The common council of a 1st class city may provide that under the city's retirement system no beneficiary may be designated for the payment of any retirement allowance, pension or proceeds of a member of the retirement system if the beneficiary is not a resident of either the United States or Canada. If a beneficiary is designated who is neither a resident of the United States nor Canada, any contributions or retirement allowance which would have been paid to the beneficiary had the beneficiary been a resident of either the United States or Canada is payable to the estate of the deceased member of the retirement system. The common council may also provide that if a death benefit would be payable because of the death of a member of the retirement system and the designated beneficiary of the death benefit is not a resident of either the United States or Canada, the death benefit which would have been paid had the designated beneficiary been a resident of either the United States or Canada is payable to the estate of the deceased member.
Wis. Stat. § 62.65