Jesse Matthew was a taxi driver in Charlottesville who targeted young woman at university campuses. DNA linked an unknown perpetrator to an abduction, rape and attempted murder in 2005, and a rape and murder in 2009.

Stephen Port preyed on young men though his grindr account, he spent hours searching web porn, a predator and he was to take the lives of four much-loved young men.

William Devin Howell kept a secret for 14 years; when a string of women went missing from towns near this Highway in Connecticut, he was responsible.

James Fairweather was born in 1999, the eve of the new millennium. He craved notoriety, he sought it through becoming a serial killer and he learned his trade on the internet, a serial killer produced by the 21st Century.

Mark Martin made no secret of the fact that when he grew up he wanted to be a serial killer. The Krays, Donald Neilson, Ian Brady all serial killers, were his childhood heroes.

As a boy Shawn Grate learnt that he could turn on a smile and get what he wanted. This sense of entitlement followed him into his twenties. He was popular with women but often in trouble for abusing them.

In Spokane three prostitutes were violently killed. Evidence suggested they'd been approached by a man wanting sex who had then used great strength to subdue and kill them.