Xavier Dupont de Ligonnès has been wanted by French justice since the spring of 2011, when his wife, Agnès, and their four children, Arthur, Thomas, Anne and Benoît, were found dead in Nantes on April 21. The case was classed as a quintuple assassinat, five premeditated murders, and an international arrest warrant was issued for the father, who had not been heard from for days. He has never been arrested. He has never been formally charged, never been questioned by the judge who holds the file and never stood trial. In law he is presumed innocent, and every statement of his guilt remains an accusation.
More than fifteen years on, the case is still at the stage of the instruction, the French judicial investigation, before the criminal division of the Nantes judicial court. In that time the Nantes judicial police, the national fugitive-tracking service and the central office that handles serious crimes against persons have worked through more than 1,750 tips from France and abroad. They have mounted operations in the Var, flown to Scotland on the strength of an identification that proved false, and checked a visitor to a religious community in eastern France. None of it has located him. The investigation has never established whether he is alive.
The family's circle stopped hearing from them in early April 2011. Investigators later placed the deaths between April 3 and April 5. In the days that followed, letters and messages went out to friends, to the children's school and to the mother's workplace announcing that the family was moving abroad, and the lease on the family's accommodation was ended. Investigators later found the messages sent in this period contradictory, and came to treat what had happened as something prepared in advance rather than something sudden.
Neighbors alerted the police on April 13. At first the household's silence was handled as a worrying disappearance, and the police considered that the family might have left of its own accord. The inquiry in Nantes widened over the following week. On April 21, 2011, the mother and her four children were found dead in the city, and the prosecutor of Nantes announced the discovery the same day.
That announcement changed the nature of the case. What had begun as a welfare inquiry into a family that had gone quiet became an investigation into five deaths, and the father, whom investigators were now actively seeking, became its central figure. He was 50 years old. He was nowhere to be found.
By the end of May the prosecutor's office was able to say how far the investigation had reached. Roughly 500 spontaneous tips had come in, and the judicial police had checked them. None had produced what the office called objective proof of his presence anywhere in France or abroad after April 15, 2011. That date, and the Var department on the Mediterranean coast, mark the limit of what investigators have ever been able to establish about him.
The case passed early from the prosecutor's office to an investigating judge in Nantes, the juge d'instruction, who has directed it from then on. Under that arrangement the prosecutor speaks for the investigation in public, while the judge orders its acts: the operations in the field, the requests to foreign authorities, the comparisons and the hearings of witnesses.
On May 30, 2011, the prosecutor issued a communiqué setting out the first new findings in several weeks. It described the case as a quintuple assassinat, said that the judicial police and the investigating judge were continuing their work, and confirmed that the father was by then the subject of an international arrest warrant. Since that spring he has been the investigation's main suspect.
The warrant has been the legal foundation of everything that has followed. It is what allowed a Scottish force to detain a traveler on French information in 2019, and it is what any police service would act on if he were found. It is not a charge and it is not a finding of guilt. Because he has never been brought before the judge, he has never been placed under formal investigation in person, never been heard in his own defense and never been given the chance to answer the case against him. A trial in his presence cannot be scheduled while he remains beyond reach.
The file has stayed in Nantes from the beginning. When the Rennes Court of Appeal, which oversees the courts of Nantes, spoke publicly in October 2019, it said that the case would remain with the Nantes investigating judges and would be handled with the same calm and impartiality as before. In March 2024 the prosecutor's office confirmed that the case was still under instruction at the criminal division of the Nantes judicial court. It had not been transferred to the national unit for serial and unsolved crimes at the judicial court of Nanterre, and closing the investigation was not on the agenda. In April 2024 the office said that the investigating magistrate and the investigation services assigned to the case were continuing their work.
The investigation turned early to the Var. The department lies at the far end of France from Nantes, and it was there, in and around the commune of Roquebrune-sur-Argens, that the record of his movements stopped in mid-April 2011. Operations in the area that year found nothing.
The investigators did not let the ground go. In November 2012 they prepared a fresh operation in Roquebrune-sur-Argens, this time with specialist cavers. A judicial source said the teams would not return to areas already covered but would concentrate on isolated places that were hard to reach. Like the work of 2011, it did not produce him.
From then on the Var became the place the case kept returning to. Investigators came back to Roquebrune-sur-Argens in 2018 and again in 2024, and in 2021 they worked in Grimaud, a commune about 30 kilometers away. Each return followed a fresh piece of information or a fresh reading of the file, and each ended without a result. The investigation has kept open, throughout, the possibility that the answer lies in the Var and the possibility that he left it alive.
In the years after 2011 the case settled into a pattern. Tips arrived from across France, from Corsica and Italy, from Africa and Thailand. About 500 had come in by the end of May 2011. More than 1,000 had been handled by early 2018, and by the spring of 2024 the figure passed 1,750. Each one had to be checked under the authority of the investigating judge, and each check came to nothing. The great majority were sightings at a distance of men who looked somewhat like him.
The most serious of these came in January 2018. Police had been told that a man at a religious community in Roquebrune-sur-Argens resembled him, and that he had been noticed in the Var the previous December. On the morning of Tuesday, January 9, 2018, a team of more than 20 officers went to the community, which lives under a rule of silence. The officers arrived without sirens, were admitted, and checked every member of the community in a long operation. The man who had resembled the fugitive at a distance was someone else. The officers left without making an arrest.
The most public false lead came on Friday, October 11, 2019. After an anonymous tip in France, police at Roissy-Charles de Gaulle airport in Paris spotted a man they believed might be Dupont de Ligonnès, but the flight left before he could be detained. They passed the alert on through Interpol, and Police Scotland stopped the man when he landed at Glasgow Airport. The warrant under which he was held was the French one that had stood since 2011.
That evening a Paris newspaper announced that the fugitive had been caught. Within half an hour France's national news agency confirmed the arrest through a source close to the investigation, and four French police sources told the agency that Scottish police had said the man's identification matched the fugitive's. Scottish officers had compared the traveler's identification data with records held for the wanted man and reported a match. Later that night Police Scotland said that a man had been arrested and "remains in police custody in connection with a European Arrest Warrant issued by the French Authorities," while his identity was confirmed. Investigators from the national fugitive service and from the Nantes judicial police set out for Glasgow. The Nantes prosecutor's office urged caution, the Rennes Court of Appeal asked that the victims' families and the presumption of innocence be respected, and the investigating judges in Nantes kept control of the case.
Overnight the identification came apart. The man had been carrying a passport in the name of a retired Frenchman from Limay, in the Yvelines department west of Paris. Police went to Limay on Friday evening, and neighbors and friends of the retiree told them he could not be the fugitive. The retiree, a man in his seventies, divided his time between France and Scotland and had no connection with the case. Well after midnight the agency reported uncertainty. Early on the afternoon of Saturday, October 12, a source close to the investigation said that a fuller identification comparison had excluded him. The man in Glasgow was not Xavier Dupont de Ligonnès, and he was released.
Police Scotland had said during the night that it was certain of the identification once it had received identification material from the French police. That certainty was the error. On Saturday the Scottish force released the traveler, and inquiries into how the mistake had been made followed.
On October 17, 2019, the Nantes prosecutor opened an inquiry into the police leaks behind the false announcement and assigned it to the IGPN, the internal-affairs inspectorate of the French national police. The leaks had broken the rule under which only the prosecutor's office speaks for the investigation.
The investigation went back to the Var in June 2021. Investigators examined several sites in Grimaud, about 30 kilometers from Roquebrune-sur-Argens, and found nothing that moved the case forward.
The spring of 2024 brought both a statement of where the case stood and a fresh check. In March the prosecutor's office set out the position: more than 1,750 tips had been received and processed, in France and abroad; the case was still under instruction in Nantes; and the investigation had not determined whether the man it sought was dead or a fugitive.
That same month, on March 12, 2024, a woman told gendarmes that a man matching the fugitive's profile had attended a prayer vigil held by a religious community in Montferrand-le-Château, near Besançon in the Doubs department. A second woman came forward with a similar suspicion. The local gendarmes treated the report as credible, and the Besançon prosecutor's office confirmed that checks were under way, although the file itself remained in Nantes. Gendarmes questioned members of the community. Gendarmes took samples from items he had used, and the comparison went to Nantes. On April 15, 2024, the Nantes prosecutor's office announced that the two profiles did not match.
In September 2024 investigators from the Nantes division for organized and specialized crime and from the OCRVP, the central office for the repression of violence against persons, carried out a further operation in Roquebrune-sur-Argens. On September 18 the prosecutor said it had brought no significant new evidence.
The last public statements from Nantes, in 2025 and March 2026, described the instruction as open there. The international arrest warrant stands. No court has ordered the case closed, no judge has ruled on the evidence, and the man the warrant names has not been found.
His guilt is unproven. He is the main suspect in the eyes of the prosecutor's office, the deaths are under investigation as five premeditated murders, and an international warrant has stood since 2011, but no court has heard evidence against him or a defense on his behalf.
Whether he is alive is unknown. In March 2024 the prosecutor's office said the investigation had not determined whether he was dead or a fugitive. Investigators have kept two possibilities open: that he died by suicide, or that he fled and began a new life elsewhere. Neither has been established.
The October 2019 identification in Glasgow was wrong. The man detained there was a retired Frenchman with no link to the case, and he was released the next day.
2011, early April: The family's circle stops hearing from them; investigators later place the deaths between April 3 and April 5.
2011, April 13: Neighbors alert the police.
2011, April 15: The date after which, the prosecutor's office later says, no objective proof of his presence anywhere has been found.
2011, April 21: His wife and their four children are found dead in Nantes.
2011, May 30: The Nantes prosecutor describes the case as a quintuple assassinat; Xavier Dupont de Ligonnès is the subject of an international arrest warrant; about 500 tips have been checked.
2012, November: Investigators prepare a further operation in Roquebrune-sur-Argens with specialist cavers.
2018, January 9: More than 20 officers check a religious community in Roquebrune-sur-Argens after a resemblance tip; the man is someone else.
2019, October 11: Police Scotland detains a man at Glasgow Airport on a French European Arrest Warrant.
2019, October 12: A fuller identification comparison shows the man is a retired Frenchman with no link to the case; he is released.
2019, October 17: The Nantes prosecutor opens an IGPN inquiry into police leaks over the false arrest.
2021, June: An operation in Grimaud, in the Var, finds nothing that moves the case forward.
2024, March: The Nantes prosecutor says more than 1,750 tips have been processed and the case remains under instruction in Nantes, not transferred to Nanterre.
2024, April 15: The prosecutor's office announces that the visitor seen at a vigil in Montferrand-le-Château is not the fugitive.
2024, September 18: The prosecutor says a further operation in Roquebrune-sur-Argens brought no significant new evidence.
March 2026: The last statement from Nantes describes the instruction as open; the warrant stands.