Co-Worker Was Last Person to See Pregnant Colorado Woman Alive

Heartbreaking video shows one of the little girls police say was killed by her father, Chris Watts, last week. Watts, 33, allegedly admitted Wednesday to killing his wife, 34-year-old Shanann, and daughters, Bella, 4, and Celeste, 3. Watts’ wife was 15 weeks pregnant at the time. "My daddy is a hero," Bella sings in the newly surfaced video. "He helps me grow up strong," Online, Shanann had gushed about their relationship, calling him "the best dad" she could ask for.