Hi, crime junkies. I'm your host Ashley Flowers. And I'm Britt. And today, I'll be taking you on a trek through the mountains of Montana, where a little-known serial killer went undetected for years despite his brazen crimes, murders that he likely would have gotten away with had it not been for the surprising investigative combo of a mother's unrelenting determination

for answers and this brand new thing that the FBI was developing. A little something that you

might be very familiar with now, but at the time no one had heard of. Criminal profiling. It was still

in its infancy at the time, but this would be one of

the very first cases where the FBI put their learning to work to catch serial killer, David Meyerhofer.

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I'm It's summer 1973 and 23, and 12-year-old Heidi Yeager wakes up to a breeze on the back of her head.

She might have had this brief hazy moment where she embraces the Montana mountain air,

but then she realizes that's all wrong.

Yes, she's outside.

She's camping with her family, but she's inside a tent.

There shouldn't be a breeze.

When she opens her eyes, it is pitch black, so she starts to like feel around

and her hand actually touches grass. And when her eyes finally adjust to the darkness, she notices

that there is this gaping hole sliced through the back of her tent. And her little sister

Susie, who had been sleeping right next to her, is gone.

Now, Heidi doesn't hesitate. She runs to wake up her parents in their nearby camper.

Bill and Marietta Yeager hurry out with flashlights, hoping to see seven-year-old Susie

wondering their campsite somewhere, maybe using the restroom. But what they find causes even more panic.

Susie's stuffed animals that she'd been sleeping with are in the grass outside the back of the

...