Michel Fourniret, the Ogre of the Ardennes who sealed his murder pact with a wedding ring

The arrangement was stated in explicit terms in the first letters. A convicted rapist, writing from prison through a Catholic magazine’s pen pal section, told a stranger he wanted to rape and murder young women. The stranger wrote back that she would help — if he killed her husband in return. Michel Fourniret and Monique Olivier had found each other.

Fourniret was born in Sedan, in the Ardennes, the same region that would later give the press its preferred name for him: l’Ogre des Ardennes. His father was a metalworker; his childhood, by his own later account, was difficult. He had criminal records for sexual assault before he turned thirty. By the time he and Olivier exchanged their first letters in the mid-1980s, he was serving prison time for rape, and he had already mapped, with some precision, the kind of partnership he wanted.

Monique Olivier, born in 1948, was trapped in a violent marriage and wanted her husband dead. The logic of their arrangement was cold and direct: she would serve as accomplice — luring victims, creating cover, providing credibility — and he would remove her husband. They married in July 1989 and moved into the Château du Sautou, an estate in Donchery, purchased with money from a 1988 robbery. Two of their victims would later be buried in its grounds.

Between 1987 and 2003, Fourniret killed at least eleven people, most of them young women and girls who were approached with Olivier nearby as false reassurance. His victims ranged in age from nine to thirty. Joanna Parrish, a 20-year-old British student on a language-teaching assignment in France, was found near Auxerre in May 1990, raped and strangled. Her family would wait more than thirty years for a definitive verdict. Elisabeth Brichet was twelve when she disappeared in Belgium in December 1989. Estelle Mouzin, nine years old, vanished on her walk home from school in Guermantes in January 2003 — and her body has never been found.

Fourniret was arrested in June 2003, in Belgium, after a thirteen-year-old girl escaped from his van and raised the alarm. Olivier began cooperating with investigators. By the time the full scope of his crimes was established, he had confessed to nine killings. In May 2008, a court in Charleville-Mézières found him guilty of seven murders and sentenced him to life imprisonment without the possibility of parole. Olivier received life with a minimum term of 28 years.

For seventeen years, Fourniret denied any involvement in the disappearance of Estelle Mouzin. During that period, her father Éric Mouzin maintained one of the most sustained public campaigns for truth in modern French legal history, pushing investigators and courts to force the couple to account for what had happened to his daughter. Fourniret played with the truth and retracted confessions multiple times. Only in March 2020 — fourteen months before his own death — did he formally acknowledge her murder. He never stood trial for it. He died on May 10, 2021, at the Pitié-Salpêtrière hospital in Paris, of respiratory complications, aged 79. For the Mouzin family, and for the families of Joanna Parrish and Marie-Angèle Domèce, there would be no confrontation in a courtroom. Only Olivier remained to face them.

That reckoning arrived in December 2023, when the Hauts-de-Seine assizes convicted Monique Olivier of complicity in three murders — those of Domèce, Parrish, and Mouzin — and sentenced her to life imprisonment with a 20-year mandatory security period. She was already serving two prior life sentences from the 2008 and 2018 proceedings. In early 2025, Olivier made further admissions regarding the disappearance of Lydíe Logé, another case investigators believe Fourniret was responsible for. The legal proceedings generated by this case have continued to accumulate well after his death.

The case became a subject of sustained documentary attention in France. The Netflix series L’Affaire Fourniret : Dans la tête de Monique Olivier — released internationally as Monique Olivier: Accessory to Evil — reconstructed the partnership and its mechanics. The book Le Pacte, published shortly after the 2004 trial, charted the origins of the arrangement. Fourniret remained, in French public memory, the clearest example of a predator who had not acted in isolation — who had required a partner, and who had found one through the most ordinary of channels.

His death in 2021 removed any possibility of a full accounting in a courtroom. Estelle Mouzin’s remains have not been recovered. The family of Joanna Parrish described Fourniret’s death as a relief mingled with frustration: a man who had evaded full judicial reckoning for decades had managed to die before the last cases could be heard. The trials he did not attend continued without him, producing verdicts in courtrooms he never entered.

Tags: true crime, France, serial killers, Michel Fourniret, Estelle Mouzin, Joanna Parrish