If a ballot is delivered to someone who no longer resides at the address to which it was mailed, please write “Not at this address – RETURN TO SENDER” and place it back in the mailbox. If a ballot is delivered to someone who is deceased, please write “Deceased – RETURN TO SENDER” and place it back in the mailbox. The Postal Service will return these ballots to the division, which will void the ballot and update the voter’s information.
Original source can be found here.