Colorado man dies on river trip at Grand Canyon National Park

For the two sisters of Chenoa Nickerson, the Arizona woman who died while hiking in Grand Canyon National Park nearly four months ago, the holiday season has been particularly heartbreaking. It’s going to be our first round of holidays without Chenoa,” Tamara Morales, 34, tells PEOPLE. “It’s been really hard,” adds Kyra Farkas, 31. “She…