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The Confession Killer takes an in depth look at Lucas who would confess to hundreds of murders while speaking to cops in the 1980s. But police would later question the validity of his claims.
Lucas, from Texas, was arrested, and later convicted, for the killing of his mother in the 1960 and two others in 1983. However, while speaking to police he would go on to confess to around 600 other murders - which would have meant he was one of the most prolific killers of all time... if he was telling the truth.
He gave detailed descriptions of his victims, even going so far as to draw some of the victims and police were able to close a number of cold cases, due to his confessions.
While handing out these details to police, Lucas was given confession interview 'privileges' including being fed steaks, milkshakes and given tranquillisers.
A voiceover from the documentary series trailer explains: "They didn't treat him as a killer but as a friend.
"Henry never lived so good, every day they brought him a strawberry milkshake. It was like he was a movie star."
He would later be convicted of killing 11 people and sentenced to death.
But it wasn't long before journalists, lawyers and other experts started to look into his 'confessions' and find that things weren't adding up.
An investigation carried out by the Dallas Times Herald was able to show that some of the killings Lucas confessed to he couldn't possibly have carried out.
But the police, including the Texas Rangers he spoke to, stood by the confessions and defended the convictions.
The five-part documentary will give viewers a close look at Lucas, his 'confessions' and the American justice system at the time.
A trailer for the new series teases: "Either they'd found the world's biggest serial killer, or it was the world's biggest hoax in American criminal justice history."
The Confession Killer lands on Netflix on 6th December 2019.
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