It may be difficult to locate some Guenette or Blais who would know about this person.
He went by Laurent but for the marriag of one of his two daughters, he was known as Laurent Justinien Moore.
His daughters were married in 1886 (Beauce) and 1889 in Matapedia region.
No record of any male descendant who got married.
I would think that Celanire remarried but so far I have not found a marriage record for her. There are several Celanire Gagnon.
For that period, in Quebec, we do not have a province-wide death registry, unfortunately.
Given that Laurent got killed, there would not be a trial associated with this event.
Are you a descendant of Laurent? I have not family relationship to those families.
Gatineau, Quebec, Canada