Chris Watts
He told Colorado investigators last month that his 4-year-old daughter, Bella, pleaded for her life. He smothered her anyway.
The Colorado man is serving life in prison for murdering his pregnant wife Shanann and their two young daughters, Bella and Celeste.
What makes some women attracted to notorious killers in prison?
But court documents show he is pinning his daughters' deaths on his wife, Shanann Watts.
WHAT'S HAPPENING
Shanann Watts' marriage was strained before she and her two young daughters went missing last week, her friend said.
Chris Watts has agreed to show investigators where he buried the bodies, according to reports.