Félicien Kabuga, the businessman accused of financing and supporting the 1994 Rwandan genocide, died Thursday while in custody at a hospital in The Hague, a United Nations court announced.

Kabuga, believed to have been in his 90s, had reportedly been suffering from dementia and had remained in legal limbo since 2023, when judges ruled he was no longer fit to stand trial.

He was among the final fugitives sought in connection with the genocide that claimed an estimated 800,000 lives, mostly members of Rwanda’s Tutsi minority and moderate Hutus.

After evading international authorities for decades, Kabuga was arrested near Paris in May 2020.

In a statement, the International Residual Mechanism for Criminal Tribunals said it would conduct an inquiry into the circumstances surrounding Kabuga’s death while in detention.

Kabuga had pleaded not guilty to charges including genocide and incitement to commit genocide.

During opening arguments in his trial, prosecutor Rashid Rashid described Kabuga as a central supporter of the killings, alleging he financed, armed and encouraged the extremist Hutu militia known as the Interahamwe.

The genocide began on April 6, 1994, after a plane carrying Rwandan President Juvénal Habyarimana was shot down near Kigali. Habyarimana, an ethnic Hutu, was killed in the crash.

Tutsi rebels were blamed for the attack, triggering a wave of mass killings carried out by extremist Hutu militias, soldiers and police forces.

Kabuga’s family had close ties to the former president’s circle, including through the marriage of his daughter to Habyarimana’s son.