Jesse Matthew was a taxi driver in Charlottesville who targeted young women at university campuses.

1. Jesse Matthew

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Documentary series exploring how the grim opportunities provided by the 21st century played a part in numerous murders.

21st Century Serial Killer

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21st century murders exposed: experts and loved ones unveil chilling truths.

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

2. Stephen Port

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.

3. William Howell

James Fairweather was born in 1999, the eve of the new millennium. He craved notoriety; he sought it through becoming a serial killer.

4. James Fairweather

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

5. Mark Martin

As a boy Shawn Grate grew up in suburban Ohio. He was a pretty normal kid; his parents divorced, and he lived with his mother.

6. Shawn Grate

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.