Due to the graphic nature of this killer's crimes,

Lister's discussion is advised.

This episode includes discussions of violence, murder,

and animal abuse and death.

We advise extreme caution for children under 13.

In early 1919, 50-year-old Henri Deseret-Londreux stood in his backyard in Gombe, France.

The winter freeze was just beginning to thaw and he watched as snow dripped from the trees.

At his feet, three dogs gazed up at him.

They were still getting used to this strange man.

Plus, they missed their owner, 37-year-old Marie Torres-Marcettier,

who they hadn't seen for a few days.

They whined for her, but Henri knew something the dogs didn't.

Marie Torres wasn't never coming back.

Henri squatted down and reached out his hand.

One curious dog stepped forward to sniff.

Henri let the animals smell him, watching it become at ease with his scent.

Finally, the dog relaxed and lit the tips of Henri's fingers.

Henri could see that the animal was starting to trust him.

Now was his moment.

In one quick motion, Henri wrapped his fingers around the dog's neck.

It panicked trying to back away from him,

but it couldn't escape Henri's grip.

...