Fox News has obtained shocking exclusive videos of cattle mutilation scenes from the San Luis valley in southern Colorado.  

“It’s the greatest unsolved crime spree in history,” says author Chris O’Brien, who recorded the videos. He wrote about his findings in his book, Stalking the Herd: Unraveling the Cattle Mutilation Mystery.

The videos depict the grisly nature of more than a dozen cattle mutilations. Mutilations differ from typical livestock deaths because the carcasses are found with body parts removed in an unusual fashion.  

The never-seen-before footage is featured in the latest episode of Tucker Carlson Originals, which is available now on Fox Nation.

The San Luis cases are just a handful of more than 10,000 mutilations that have stumped ranchers and investigators across the United States for decades.

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