I think this comes from an adaptation (but I don't know which one), since in the original Caderousse kills the jeweler with a knife and not an axe, only does so after his wife pushes him to it, and it's the jeweler who kills the wife in self-defense with a pistol.
Regarding this part of the The Count of Monte Cristo example:
I think this comes from an adaptation (but I don't know which one), since in the original Caderousse kills the jeweler with a knife and not an axe, only does so after his wife pushes him to it, and it's the jeweler who kills the wife in self-defense with a pistol.