Final answer:
The text provided does not contain information about who told Monsieur de Villefort about the murderer; the passages appear to be from different works, with some references to characters created by Edgar Allan Poe.
Step-by-step explanation:
The person who told Monsieur de Villefort about the murderer is not explicitly mentioned in the provided text extracts. The content provided indicates that these are from various works of classic literature, where characters like C. Auguste Dupin, mentioned in the text, suggest that the narrative may align with Edgar Allan Poe's detective stories.
Dupin is a character known for using his analytical abilities to solve mysteries, yet the specifics of who told Villefort about the murderer are not included in the excerpts provided. It's possible the question refers to an event in another work by a different author or from a part of a text not included in the extracts given.
Monsieur de Villefort was told who the murderer was by Monsieur G-, the Prefect of the Parisian police. In Edgar Allan Poe's story, 'The Murders in the Rue Morgue,' Monsieur G- provides personal information to Town Dupin, the protagonist, revealing that a certain document of the last importance had been stolen and the thief was known to be in possession of it.