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 perpetr...

The story behind the murder of 16-year-old Becky Watts, who was killed by her stepbrother Nathan Matthews and his 21-year-old partner Shauna Hoare in Bristol in February 2015. This programme documents the huge police manhunt that unfolded in the wake of her disappearance, and the police investigation which eventually brought her murderous stepbrother to justice.

Experts examine some of the Victorian era's most extraordinary and gruesome killings, exploring their similarities with those in today's news headlines.