5 MAR 2025 · Today we will be concluding a true crime deep dive into arguably the most famous murder mystery in the history of France.
If you missed it, be sure to listen to part 1 first.
On April 21, 2011, police would discover the bodies of Agnès Dupont de Ligonnès, her four children Arthur, Thomas, Anne, and Benoît, and their two Labrador dogs buried in the back garden of their family home at 55 Boulevard Schuman in Nantes Loire-Atlantique, France. Agnes's husband, Xavier, was nowhere to be found.
This was a picture perfect family stemming from nobility and Catholicism. They were full of personality and intelligence. They were well known and involved in their community.
But throughout the investigation into these murders, it became apparent to police this family had deep and troubling secrets. In the coming weeks, Xavier would become the prime suspect in murders. He remains missing to this day.
This is the story of the Dupont de Ligonnes family murders.
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SOURCES:
1) Unsolved Mysteries, 2020, Volume 1 Episode 3, "House of Terror"
2) Wikipedia
3) https://www.connexionfrance.com/news/man-suspected-of-killing-family-reported-to-be-at-french-convent/652210
4) Reddit
5) https://www.sportskeeda.com/us/shows/unsolved-mysteries-5-wild-reddit-theories-xavier-dupont-de-ligonns-disappearance
6) https://www.marieclaire.com/culture/a33216440/dupont-de-ligonnes-family/
7) https://detectivebox.com/blogs/blog/tout-sur-laffaire-xavier-dupont-de-ligonnes?srsltid=AfmBOorSHV7_RDwPfBfjxdGCaYY5b4C7RugaSDaFIGhsVMoZHFdLsKWA
8) https://www.radiotimes.com/tv/documentaries/true-crime/xavier-dupont-de-ligonnes-unsolved-mysteries/
9) https://unresolved.me/the-dupont-de-ligonns-affair
10) https://www.statista.com/statistics/1418867/homicide-rate-france/
11) https://www.ojp.gov/pdffiles1/nij/230412.pdf
12) https://www.youtube.com/watch?v=-TKUCoaJfKQ
13) https://www.babelio.com/livres/Fonteneau-Sans-pitie-pour-les-siens/977240
14) Audio clips at beginning credit to https://www.youtube.com/watch?v=V4jrFlu_wz4&t=1s and https://www.youtube.com/watch?v=hXUaXUZrlT8