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The Casual Criminalist

Unsolved: The Dupont de Ligonnès Family Murders

The Casual Criminalist

Cloud10

True Crime

4.83.6K Ratings

🗓️ 18 February 2026

⏱️ 76 minutes

🧾️ Download transcript

Summary

An aristocratic French family slaughtered and buried beneath their home. A father who vanished without a trace. Fifteen years later, Xavier Dupont de Ligonnès remains one of Europe’s most haunting unsolved mysteries. Sponsor: HelloFresh.com/casual10fm to get 10 free meals + a FREE Zwilling Knife (a $144.99 value) on your third box Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0

Hello, everybody, welcome back to another episode of Decoding the Unknown.

0:06.1

This today, by Emma, the DuPont-Delegan family murders.

0:11.0

You need to look out the pronunciation on that one.

0:13.5

And a DuPont I can do, but Delegant.

0:17.0

This is one of those ones where it might just not be in the pronunciation dictionary.

0:20.2

I use something called Forvo.com, by the way, which is, uh, which is pretty good. There's also how'd you say. DuPont de Ligonese family me does. Yes, let us begin. Emma says you should definitely pull out your pronunciation guide for this one since I've no idea. That's a correctly pronounced spedged anything. Okay, I'm going to get the name right, and then I'm going to guess I've got a C in GCSE French.

0:42.8

My... no idea. How to correctly pronounce spenge anything. Okay, I'm going to get the name right, and then I'm going to guess. I've got a C in GCSE French. My worst grade. My son, wait.

0:46.7

I'm not a language person. Let's jump in.

0:58.7

On the 13th of April, 2011, members of the Hedanga family received a letter in the mail.

1:04.5

In the letter, their brother-in-law, Xavier DuPont de Legonez, explains that he and his family had some good and unexpected news to share. Xavier informed them that had been working alongside

1:09.4

the U.S.'s Drug Enforcement Agency, or DEA for several years, tracking now drug dealers who were operating in nightclub. to share. Xavier informed them that had been working alongside the US's drug enforcement agency

1:11.2

or DEA for several years, tracking down drug dealers who were operating in nightclubs all over France.

1:17.4

All right. Dea, a little bit of extrajudicial work there. He told them that had recently been

1:23.4

instrumental in the arrest of several drug kingpins and now at a testifying court in the

1:27.5

US. Because of this, he and his family were being taken into witness protection, and they wouldn't

1:31.7

be able to contact the rest of their family members for several years to come. Holy shit,

1:36.1

why'd you do this? This sounds really miserable. The family was immediately suspicious of Xavier's

1:41.4

claims and contacted the police in the city of Nantes in France.

1:45.0

They asked the police to do a welfare check on Xavier's wife and four children and were later

1:49.3

informed that the family home was empty. Uh-oh! Xavier's killed them all, in my opinion, so far.

1:54.7

The clothes were gone, the beds had been stripped, and a note to the postal agency had been left

1:58.5

informing them that all mail would be returned to sender.

...

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