Ridgway remains one of the most prolific murderers in U.S. history. He evaded capture for decades, even killing prostitutes while his young son waited in the back of his car.

Pickton was a pig farmer who killed 49 women before feeding them to his hogs. He was caught when an undercover police officer was placed with him as a cellmate.

Two British serial murderers who killed a generation apart, but with a common goal - they killed to achieve an infamy that had eluded them in everyday life.

Few serial killers have divided opinion like Aileen Wuornos. Having gunned down six people, she confessed to her crimes. But this was not enough to save her from the green mile.

Nilsen murdered 15 young men, whose bodies he sought to preserve as companions before dismembering their remains for disposal down the toilet.