Martin Ney, sometimes dubbed “the Masked Man” in German media reports, has been charged with murder and kidnapping over the disappearance of Jonathan Coulom at a school holiday camp in western France, prosecutors said.
Coulom's body was found bound and weighed down by a concrete block in a pond more than a month after he was snatched from a dormitory at the seaside camp in Brevin-les-Pins.
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Jonathan Coulom went missing in 2004. Photo: AFP
Ney, 50, was charged and transferred to the French city of Nantes from his high-security jail in Germany after telling a fellow prisoner he had killed Coulom, French lawyer Catherine Salsac said.
“Investigators found similarities between the methods used,” said Salsac, who represents Coulom's family, referring to Ney's murders in Germany.
She said the investigation had “accelerated” after the alleged confession.
Ney, who wore masks and balaclavas during his attacks, was jailed for life in 2012 after he confessed to killing three boys aged between eight and 12.
The British press has also linked him to the disappearance of Madeleine McCann, who was snatched from her parents' rented apartment during a holiday in Portugal in 2007.
German prosecutors are investigating a different man, 43-year-old paedophile Christian Brueckner, in connection with the McCann case.