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Since canon lawyers are lawyers afterall and probably think in “belt and suspenders” mode, they would probably do something similar. For example, the attorney would file a Can. 1701 proceeding (for lack of a better term) with the bishop seeking a declaration of presumed death, and, alternatively, a petition seeking dispensation from the bonds of matrimony (something the Holy See has the authority to do under the power of the keys).
Perhaps this invites some comment from a canon lawyer. Personally I never comment on secular law and refer inquirers to civil lawyers.
Canon 1701 would not apply unless the smoke of a non consummated marriage were to be presented, and this does not seem to be the case in the original scenario. It would be a separate matter than the question of presumed death.
Canon 1701 is found in the chapter on
Procedure For Dispensation Of Ratified & Non-consummated Marriage. Canon 1707 is found in the chapter on
Procedure In Presumed Death Of A Spouse. Canon 17 requires us to heed the context in which an ecclesiastical law exists, and the context of the chapters easily manifests that these are two separate juridic institutes that are to be distinguished.
Even so, not even the Roman Pontiff can dissolve from a ratified and non consummated marriage by a dispensation super rato (see c. 1141 and c. 1698).
In regard to this, we might keep in mind that, according to canon 1142, this is a personal act of the Roman Pontiff rather than one of the Holy See which is a broader notion (see c. 361). According to Pastor Bonus, art 67, the Congregation for Divine Worship and the Discipline of the Sacraments merely examines the case, and if warranted, submits the petition to the Supreme Pontiff.
That said, either the spouse or someone who has been given a legitimate mandate may petition for the declaration in canon 1707.
However, the value of stability in the law would seem to dictate that a declaration not be subject to some periodic review since it fixes the canonical status of the petitioner as free to marry. If it were subject to some kind of continuing ratification, then the person’s status would remain doubtful and his or exercise of rights in canon 1058 (to marry if not impeded) and canon 219 (the choice of state of life) would be injured. The law disfavors instability since its purpose in part is to regulate external behavior with a view toward the salvation of souls.
However, since the status of persons never becomes a res iudica, with a certain rare exception related to nullity of marriage, a later discovery that the other spouse survived would present a perplexity to be resolved by the Holy See and perhaps the Roman Pontiff personally.