<p>Brianna Cook poses for a photo on Christmas morning in Pinehurst. Cook, 17, was found dead in her father's Pinehurst home on Oct. 26, 2013.</p>
February 2, 2016
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February 2, 2016 8 p.m.
Death in the Valley Part Three: The space between
Last of three parts
In a letter sent to the Idaho State Police on Nov. 8, 2013, the agency was asked to launch an investigation into the death of 17-year-old Brianna Cook.