It would take more than three decades for investigators to learn who shot Barbara Rocky, a 1974 Brigham Young University student, to death in Big Cottonwood Canyon. 

Patricia Kimmi vanished in November 2009, but investigators suspected foul play after discovering her dentures, a money clip covered in blood, and bloody coins not far from her Kansas home.

"My whole world changed," Laurie Stout's sister said of the moment she learned her big sister was dead. "I no longer had my confidante and no longer had my best friend. It was horrible."

Dennis and Merna Koula had been devoted grandparents and parents when they were gunned down in their quiet Wisconsin community in May of 2010.