On May 18, 1882, at Chatou, Louis Aubert repaired to a villa rented under an assumed name. He believed he was to meet Gabrielle Fenayrou, whose lover he had once been. Marin, Gabrielle’s husband, lay in wait in the darkness, armed with a hammer and a sword-cane. Lucien Fenayrou, Marin’s brother, had assisted in the preparations. Yet the affair cannot be reduced to a common crime of jealousy: vanished letters, contradictory confessions, and two successive trials make it equally an inquiry into what a court may resolve, and what it must subsequently begin anew.
These facts reach us through H. B. Irving, who published A Book of Remarkable Criminals in 1918. His chapter on the Fenayrous is a retrospective chronicle, not an original transcription of the assize hearings. Irving refers to contemporary works from 1882, notably Henri Bataille’s Causes criminelles et mondaines and the volume by Gustave Macé, as well as the recollections of the presiding judge, Bérard des Glajeux. He weaves together courtroom extracts, second-hand accounts, and personal judgments; the motives he imputes to the accused are thus not all established facts of the trial.
Marin Fenayrou had learned the apothecary’s trade in Paris. The widow of his former master had entrusted the dispensary to him and bestowed her daughter Gabrielle in marriage. Louis Aubert subsequently entered the shop as an apprentice. He remained there several years, assisted in its daily commerce, and entered into an intrigue with Gabrielle. In 1880, he left the establishment to open a pharmacy of his own. The liaison had ceased, yet Aubert retained certain letters written by Gabrielle. According to Irving, the couple sought to recover them; their precise contents and the weight Aubert attached to them remain undisclosed.
Marin’s fortunes were foundering. He had sold his dispensary, compromised himself in a fraudulent scheme involving the counterfeit of a mineral water, and had lately been sentenced to three months’ imprisonment and a fine. Aubert, by contrast, had prospered. The existence of the correspondence, financial rancour, and the former intimacy compose several possible motives. Irving suggests that Marin went in dread of what Aubert knew concerning him; yet he concedes that the secret Aubert claimed to hold was never brought to light. Nor would this enigma be resolved by the verdicts.
On March 22, according to the account Marin would render later, he learned of the intimacy between Aubert and his wife. He stripped her of her wedding ring, her jewels, and her bridal crown, then announced that she must assist him in slaying her former paramour. The following day, he repaired to the police station to demand that the letters be retrieved; the officer refused. Marin’s mother-in-law attempted in turn to demand them, without success. These letters vanished following Aubert’s death. The chronicle elevates their absence into a central mystery, yet nothing survives to permit a reconstruction of their contents.
In the spring, Marin leased a villa at Chatou under the name of “Hess.” He purchased implements, prepared a sword-cane, and drew Lucien into his design. The three adults visited the premises on several occasions. Irving’s narrative details their movements, train timetables, and purchases, relying in part upon depositions summarised by the author and upon the memoirs of Macé and the presiding magistrate. The project was no sudden improvisation: Aubert was drawn to Chatou by a missive from Gabrielle, dated May 14, proposing a resumption of their commerce.
Before settling upon his method, Marin is said to have contemplated several contrivances: spectacles fitted with steel spikes, and subsequently a wolf-trap. He ultimately settled upon the hammer and the sword-cane. According to Irving, the three adults spent the afternoon of May 18 preparing the house, flattening a lead gas-pipe, and considering how the corpse might be concealed. The author describes their railway tickets and their repasts—particulars that render the contrivance palpable, but which reach us filtered through depositions taken after the event. They demonstrate premeditation; they do not, of themselves, reveal what passed in the mind of each participant.
On the evening of Ascension Day, Gabrielle and Aubert departed from the Gare Saint-Lazare. Marin and Lucien had already reached the villa. Aubert stepped into a darkened chamber; Marin felled him with the hammer. A struggle ensued; Gabrielle intervened; then Marin struck once more and ran him through with the sword-cane. These particulars belong to Irving’s retrospective account, which reports the witness statements and formal declarations without furnishing a verbatim transcript of each deposition. He depicts a concerted assault and a victim caught in an ambuscade; the precise degree of each actor's complicity would become the very crux of the trials.
After eleven o’clock, the two men conveyed the body to the Chatou bridge in a small handcart. Weighted down with lead piping, it was lowered into the Seine. On May 27, the remains were discovered near Le Pecq. Irving observes elsewhere that “eleven days elapsed,” an interval inconsistent with the absolute dates of his chapter; we retain here the date of May 27 without elevating this discrepancy to a certainty. The inquest turned toward the Fenayrous after an anonymous letter denounced them and the police recalled Marin’s prior application regarding the correspondence. Arrested on June 8, Gabrielle confessed to Chief of the Sûreté Macé during the railway journey to Versailles. Lucien was taken into custody as well. Marin at first denied all, then admitted his share during the reconstruction at the villa.
In August 1882, the three prisoners stood before the Court of Assizes of Seine-et-Oise at Versailles. Irving dates their committal to August 19, a date irreconcilable with secondary authorities placing the sittings from August 9 to 12; lacking a collation of the original 1882 transcripts, we retain only the month and the venue. The presiding judge, Bérard des Glajeux, interrogated Marin on the cause of so minutely devised a murder. The prisoner pleaded vengeance. The magistrate countered that the ambuscade, the concealment of the corpse, and the pains taken to efface all traces hardly resembled a homicide provoked upon the instant. He advanced alternative hypotheses, among them the dread that Aubert might disclose ruinous secrets. These were the judge's interrogatories, not verified findings of blackmail.
Gabrielle maintained that she had aided her husband only out of remorse for her infidelity and fear for her children. The presiding judge confronted this version with her role in appointing the tryst, her entry into the room during the fray, and her admissions following her arrest. Lucien is depicted by Irving as having had scarce reason of his own to act, save for devotion to his brother. The defence and the prosecution presented divergent readings of Gabrielle’s initiative. The author, for his part, assumes a severe tone, pronouncing psychological judgments where the recorded docket appears far less distinct.
A point of procedure was to overturn the result. A journalist, formerly Gabrielle’s lover, had furnished information touching their liaison. Out of regard for delicacy, his deposition was read aloud in his presence, without oral examination from the bar. The Versailles jury condemned Marin to death, Gabrielle to penal servitude for life, and Lucien to seven years' imprisonment. According to Irving, the Court of Cassation subsequently annulled the proceedings on the ground of this irregularity. The annulment acquitted none of the accused, nor did it rule anew upon the facts: it necessitated a second trial.
The proceedings resumed in Paris on October 12 before the Seine Assizes. On this occasion, Marin was granted extenuating circumstances, Lucien was acquitted, and Gabrielle’s sentence remained unaltered. The chapter does not detail the grounds that might account for the divergence between the two juries; one must not, therefore, regard the second outcome as a single verdict revised in its entirety. The capital sentence pronounced against Marin at Versailles was not carried into execution prior to his appeal.
Marin was subsequently transported to New Caledonia to serve his sentence. Irving records that he obtained permission to open a dispensary there, forfeited it on grounds of dishonesty, and ended his days as a boatman, dying of cancer of the liver. Gabrielle, meanwhile, became an overseer of works in the prison where she was confined. These particulars are drawn from the coda of the 1918 volume and do not rest on judicial records. Irving relates them in a few lines, without dates for Marin’s transportation or death, and without citing an independent authority within the chapter. They prolong the narrative beyond the courtroom, yet their historical certainty is inferior to that of the verdicts whose stages the chronicler delineates. We add neither date nor biographical embellishment. The affair leaves behind a documentary limit: the chapter preserves neither the complete debates nor the original minutes. It permits us, however, to trace a premeditated crime, two distinct judicial readings of complicity, and a reversal provoked by a precise procedural defect, without confounding these three moments.