
This episode covers the brutal murder of Rachel Nickell in 1992, the subsequent investigation, and the eventual capture of her killer, Robert Napper. Key discussions include the violence of the crime, the impact on Rachel's son Alex, and the police's fixation on an innocent man, Colin Stagg.
The episode opens with the shocking details of Rachel Nickell's murder on Wimbledon Common, where she was stabbed nearly 50 times in front of her 2-year-old son, Alex. The narrator describes the horror of the crime and the immediate public outrage.
Experts, including Geoffrey and Dr. Yardley, discuss the psychological profile of Robert Napper, who committed similar crimes, including the murder of Samantha Bissett and her daughter Jazmine. The brutality of Napper's actions is highlighted, emphasizing the sadistic nature of his attacks.
The investigation focuses on the wrongful targeting of Colin Stagg, who was arrested based on flawed profiling techniques, while Napper remained free. The episode details the failures of the police and the eventual DNA evidence that linked Napper to Rachel's murder.
Finally, the episode recounts the long journey to justice, culminating in Napper's guilty plea for Rachel's manslaughter in 2008. The emotional toll on the victims' families and the lasting impact of the case on British society are discussed.
Rachel Nickell's murder in 1992 led to a flawed investigation, wrongful arrest, and the eventual capture of her killer, Robert Napper.

This episode stands out for the following:
What started off as such a normal day had become an incredible human tragedy.World's Most Evil Killers - Season 4, Episode 5 - Robert Napper - Full Episode
Rachel's young son, Alex, was left alone, clinging to his mother's blood-soaked body.World's Most Evil Killers - Season 4, Episode 5 - Robert Napper - Full Episode
The violence takes the place of it.World's Most Evil Killers - Season 4, Episode 5 - Robert Napper - Full Episode
He was totally shocked, and he was immediately handcuffed.World's Most Evil Killers - Season 4, Episode 5 - Robert Napper - Full Episode
It was a satisfying moment, but it was more than that, it was--it was relief.World's Most Evil Killers - Season 4, Episode 5 - Robert Napper - Full Episode