An affidavit by any person having knowledge of the fact, setting forth the fact of the death of one owner and establishing the identity of the surviving owners named in the deed to any plot, when filed with the cemetery authority operating the cemetery in which the plot is located, is authorization to the cemetery authority to permit the use of the unoccupied portion of the plot in accordance with the directions of the surviving owners or their successors in interest.
ORS 97.620