With the verdict, one of the most distressing criminal cases of the past decades in France comes to an end. On June 4, 2026, the Loire-Atlantique jury court sentenced the German serial killer Martin Ney to life imprisonment for the abduction and murder of ten-year-old Jonathan Coulom.
The case had occupied the French public since spring 2004. At that time, Jonathan was on a school trip to the coastal town of Saint-Brévin-les-Pins when he vanished without a trace during the night of April 6 to 7. Investigators, helpers, and relatives searched for the boy for weeks. Six weeks later, the sad certainty followed: his body was found in a pond near Guérande. The body had been weighed down with a concrete block.
The investigation evolved over many years into a real labyrinth. Numerous leads went cold, suspects came into focus and then disappeared again from the justice system’s view. Only gradually did the evidence against the German Martin Ney solidify.
The now 54-year-old is one of Germany’s most notorious child murderers. Under the nicknames “Man in Black” and “Masked Man,” he had already made headlines long before the French trial. German courts convicted him in 2012 for the murder of three boys between 1992 and 2001 as well as for numerous sexual assaults on minors. Ney has therefore already been serving a life sentence in Germany.
In the trial in Nantes, the defendant denied any responsibility for Jonathan Coulom’s death. There was no confession. The prosecution therefore relied on a multitude of circumstantial evidence. Investigators pointed out striking parallels to Ney’s previous crimes, reconstructed his movements at the time, and presented witness statements. Particular attention was drawn to the testimony of a former cellmate who reported incriminating remarks made by Ney.
For the prosecution, this painted a clear picture. The prosecution spoke of a “criminal signature” that clearly pointed to the German serial offender. Accordingly, the Attorney General requested the maximum sentence.
The court followed this reasoning with the guilty verdict.
For Jonathan’s family, the verdict means above all one thing: a late closure after more than 22 years full of uncertainty, pain, and hope for answers. After the verdict was announced, the boy’s stepfather spoke of a moment of justice. Jonathan can now finally rest in peace.
However, the tragedy will never completely disappear. The Jonathan Coulom case remains a reminder of how long the search for truth can take—and how persistently investigators have to work across borders to enable justice even decades later.
By C. Hatty