In this Oct. 22, 2016 photo, Kathy Thornton sifts through documents throughout her 39-year search for her sister Christine Thornton in Rawlins, Wyo. Christine disappeared during the summer of 1977 after leaving Texas on a road trip with her then-boyfriend to pan for gold in Montana.
In this Oct. 22, 2016 photo, Kathy Thornton sifts through documents throughout her 39-year search for her sister Christine Thornton in Rawlins, Wyo. Christine disappeared during the summer of 1977 after leaving Texas on a road trip with her then-boyfriend to pan for gold in Montana. Jenna VonHofe Casper Star-Tribune
In this Oct. 22, 2016 photo, Kathy Thornton sifts through documents throughout her 39-year search for her sister Christine Thornton in Rawlins, Wyo. Christine disappeared during the summer of 1977 after leaving Texas on a road trip with her then-boyfriend to pan for gold in Montana. Jenna VonHofe Casper Star-Tribune

How Kathy Thornton solved her sister’s 39-year-old murder case

November 23, 2016 06:10 PM

UPDATED November 23, 2016 06:15 PM

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