NEED TO KNOW

Agnès Dupont de Ligonnès, 48, and her four children were found buried beneath the patio of their Nantes home in April 2011

Investigators say the victims were sedated and shot with a .22-caliber rifle before being placed under the terrace with the family’s two dogs

Her husband, Xavier Dupont de Ligonnès, vanished that same month and remains missing under an international arrest warrant despite more than 900 reported sightings over the years

He was a debt-ridden aristocrat with a crumbling life — and when his family was found buried under the patio, he vanished without a trace.

In April 2011, police in Nantes, France, uncovered five bodies wrapped in sheets, dusted with lime and buried beneath a suburban garden, according to France24 . A mother, her four children and the

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