The shake of a head that revealed to body language experts a Valentine's Day killer's crime
The simple shake of a head and squeezing eyes shut helped body language experts reveal a Valentine's Day killer after he tried to hide his guilt.
Joanne Nelson vanished from her home in Hull, England, in February 2005 and her body was found strangled and dumped over 100 kilometres away.
Her boyfriend Paul Dyson, then 31, appeared in an emotional television interview to plea for her killer to come forward, but French body language experts said he showed all the telltale signs of lying.
In the documentary Faking It: Tears of a Crime, experts said Dyson squeezed his eyes shut for his tears to run down his face and had crescent-shaped fingernail marks on his thumbs, Mail Online reported.
"There was a long eye closure, for one and a half seconds. It's a squeeze and one of the tactics an individual can use is to squeeze the eyes to try and get tears to run down the cheek," body language expert Cliff Lansley told the program.
"He is attempting to show sadness but we will notice now the brows have dropped. He is not in a sad state anymore but he is trying to continue the act of portraying he's distressed and concerned and sad.
"He is clearly attempting to make himself cry or to create tears, or create sounds which people might judge to be sadness."
Officers were unaware Dyson was going to appear on a televised interview until it aired.
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But head of the major incident team in Humberside Police, Ray Higgins, said the interview backfired for Dyson as a zoomed in shot of his hands helped him notice the fingernail marks on his thumbs.
"In the interview, there was two marks on his thumbs. I knew from dealing with other previous assaults and murders that involved strangulation, the first thing a victim will do is to try and pull those hands away from their neck," he said.
Dyson admitted he lied to police after being dobbed in by a friend he told about Ms Nelson's death.
He was sentenced to life imprisonment in November 2005.
