Cliff Lansley

Author Helen Bailey thought she'd found the perfect ending to her own story when she met Ian Stewart, but this was no fairy-tale romance; it was a story that would end in her murder. When the renowned writer of children's books was reported missing, her fiancé Ian Stewart claimed that she had simply gone to her holiday home in Broadstairs to 'clear her head'. Later, he was charged with her murder when her body was discovered in a cesspit underneath their home, killed by her fiancé who stood to inherit the 4 million estate.

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Whether thrust into the limelight or fame hungry attention seekers, they all shared one thing: their public deception led to their demise. The signs were in front of us, but how do you spot a criminal?In this exclusive ID series, a crack team of three experts - body language, voice and psychology - analyse iconic TV appeals by those who claimed to be grief stricken but turned out to be the perpetrators.

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