The European Court of Human Rights (ECtHR) has declared inadmissible an application concerning the prolonged investigation into the disappearance of a nine-year-old girl in France, finding that the domestic authorities had ultimately acknowledged the investigative failures and provided appropriate redress.
The case concerned Eric Mouzin, whose daughter Estelle disappeared in January 2003 while walking home from school. A criminal investigation was opened immediately, with Mr Mouzin and Estelle’s mother joining the proceedings as civil parties. Despite numerous investigative efforts, the case remained unresolved for many years.
In November 2019, convicted serial killer Michel Fourniret was charged in connection with Estelle’s abduction and detention resulting in death. His former wife, Monique Olivier, was subsequently charged with aiding and abetting the offences. Mr Fourniret died in 2021, while Ms Olivier was convicted in December 2023 and sentenced to life imprisonment. In May 2024, the Assize Court ordered her to compensate Estelle’s family.
Mr Mouzin brought proceedings before the ECtHR in March 2019, alleging that the investigation had been ineffective and excessively prolonged, contrary to Articles 2, 6 and 13 of the European Convention on Human Rights. He also pursued domestic proceedings against the French State for gross negligence and denial of justice.
In September 2025, the Paris tribunal judiciaire found the State liable for the defective operation of the justice system and awarded Mr Mouzin €50,000 in compensation for non-pecuniary damage.
The ECtHR considered the application solely under Article 2, which imposes a procedural obligation on States to conduct effective investigations into suspected unlawful deaths. It rejected the Government’s argument that Mr Mouzin should have awaited the conclusion of the domestic criminal proceedings before bringing his complaint, particularly given the extensive delays.
However, the Court accepted the Government’s argument that Mr Mouzin had subsequently lost his status as a victim under Article 34 of the Convention.
The Court acknowledged the serious investigative shortcomings and prolonged delays, which had caused Mr Mouzin considerable suffering and left the family without answers for almost 20 years. Nevertheless, it found that the criminal proceedings had ultimately identified those responsible and secured Ms Olivier’s conviction.
Crucially, the domestic civil proceedings had expressly recognised the State’s gross negligence and awarded compensation for the resulting harm. The ECtHR considered that these findings amounted to an unequivocal acknowledgment of a breach of the procedural obligations under Article 2.
Taking the criminal and civil remedies together, the Court concluded that the domestic legal system had ultimately established the relevant facts, secured accountability and provided appropriate redress.
Accordingly, the ECtHR declared the application inadmissible, finding that Mr Mouzin could no longer claim victim status under Article 34 of the Convention.