Police say Aransas Pass, Texas, teen William 'Quince' Colburn III (pictured at left) fatally shot his parents at little sister (upper right) at an RV park (bottom right), before posting photos of their dead bodies on social media. When officers arrived at the family's home to investigate, the 15-year-old boy turned the gun on himself. Two dogs were also killed. Relatives said they're struggling to understand the triple-suicide, which left them 'hurt, lost, and angry'.