Sick killer Chris Watts described how he murdered his two children Bella, aged four, and Celeste (Cece), aged three, in one of his disturbing prison letters to true crime author Cheryln Cadle.
The letter laid out how the murderer attempted to smother his two children before strangling his pregnant wife Shanann at their home in Frederick, Colorado.
However, his attempt to murder his daughters failed as they woke up bruised and traumatised from what they had endured.
