Feb. 9, 2010. Wenatchee, Washington. Beauty school student Mackenzie Cowell left class and said she would only be gone for 15 minutes. She didn't return. Days later, her mutilated body was discovered near the Columbia River. Who killed her? Her boyfriend? Her mother's boyfriend? Drug dealers? Or a fellow student? Conflicting information and confusing evidence didn't prevent this case from reaching a conclusion.

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