Cliff Lansley

Idol on stage. Monster off-stage. R&B superstar R. Kelly was a serial sex offender who secretly targeted underage victims for more than two decades. Experts pinpoint the tell-tale signs of a predator.

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.