At dawn, 65-year-old Nelly Mutandwa swapped her pajamas for leggings, a T-shirt and sneakers. Surrounded by rows of graves, she joined other members of the Commandos Fitness Club in an hour-long sess...

For years, the death of 15-year-old Danielle "Danni" Houchins had been shrouded in mystery. Montana investigators initially said it could have been a tragic accident, but her family always s...