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The disappearance of pregnant mother and her two children was huge news in America in 2018, with Chris Watts making a desperate plea on camera for the safe return of his wife Shannan, and two children, Celeste, three, and Bella, four.
However, the world was left thoroughly chilled when detectives discovered it was Chris himself who was responsible for killing his entire family, in order to keep his affair under wraps.
But while his murders seemed cold-blooded, Chris does feel guilt for his actions, according to body language experts.
When the alarm was raised that Shanann, Bella and Celeste had gone missing, Watts put himself at the centre of the search to find them.
And, when Watts' neighbour told police that his porch-side surveillance camera - which points directly at the Watts property's driveway - had been filming on the night of the disappearances, it looked like a step in the right direction to finding Shanann and the kids.
Shown on police bodycam footage as he watches the CCTV tape, Watts is visibly agitated, swaying side-to-side and doing his best to not look at the video.
As Kerry explains, these are early signs of Watts' guilt and his inability to cope with the stress he has created for himself.
"If you were genuinely concerned about the whereabouts of your family, you would be glued to that CCTV footage. But what we see here is Chris Watts fiddling with his telephone," she says.
"So, what does that tell us? Well, what I believe is that it tells us he doesn't want to look at the CCTV, because he's got to confront his own guilt. Not only that, he's got to possibly feel his own guilt."
The fact that Chris can feel emotions shows he's not actually psychopathic in his thought processes. Psychopaths are characterised by their inability to register emotions, and never feel guilt.
Instead, Kerry believes he is an "emotionally inadequate man" - which makes him all the more terrifying.
"There is nothing in his history whatsoever that points to him being a psychopath," she said. "And you don't become a psychopath on one or two days out of the year. He is an emotionally inadequate man, and emotionally inadequate men are part of the society that we live in."
In addition, Kerry suggests that the Chris Watts case is a sobering reminder of just what every day, unassuming people can be capable of. "They are in our communities, and that is the thing that is truly unnerving about this case. He [Watts] could be one of our neighbours."
Chris pleaded guilty to the murders of his wife and two children and was handed five life sentences - three consecutive and two concurrent - without the possibility of parole. He also received an additional 48 years for the unlawful termination of Shanann's pregnancy and a further 36 years for three charges of tampering with a deceased body.
Chris Watts: A Faking It Special will be available to stream from Saturday 15th May exclusively on discovery+
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