N.J. Stat. § 19:63-21: Rejection of ballot mailed in by voter subsequently deceased.

21. Whenever the county board receives evidence that a mail-in voter who has marked and forwarded a mail-in ballot has died before the opening of the polls on the day of the election, the ballot shall be rejected by the board and retained by it in the same manner as provided by this act for other rejected ballots.

L.2009, c.79, s.21.