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On 15 July 1992, 23-year-old Rachel Nickell took her two-year-old son for a walk on Wimbledon Common.

She never came home.

What followed was one of the most shocking murders in modern British history and one of the greatest investigative failures the UK has ever seen.

As police faced intense public pressure to catch the killer, they became convinced they had found their man. Colin Stagg was subjected to surveillance, psychological profiling and an extraordinary undercover “honeytrap” operation. Yet there was one devastating problem.

They had the wrong suspect.

While detectives focused on proving Stagg’s guilt, the real killer remained free.

In this episode of What They Hide, we examine the murder of Rachel Nickell, the controversial investigation that followed, the destruction of an innocent man’s life, and the eventual identification of serial offender Robert Napper through advances in DNA technology.

This is a story of tragedy, tunnel vision, missed opportunities and a painful reminder that justice means finding the right person—not simply finding someone.

The Murder of Rachel Nickell: A Killer Hidden in Plain Sight.

⚠️ Content Warning: This episode contains discussion of murder, sexual violence, serious injuries, mental illness and crimes involving children as witnesses to traumatic events.

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Sources

Books

And Then the Sun Came Up — Paul Britton
The Jigsaw Man — Paul Britton
In Pursuit of the Truth — various criminal justice references

Official & Legal Sources

Metropolitan Police Service investigation records and public statements
Independent Police Complaints Commission review of the Rachel Nickell investigation
Old Bailey court proceedings relating to Colin Stagg
Court proceedings relating to Robert Napper’s admission of responsibility for Rachel Nickell’s killing

Documentaries & Broadcast Sources

The Witness
The Real Story: The Wimbledon Common Murder
BBC News archive coverage
ITV News archive coverage
Channel 4 News archive coverage

Newspaper Archives

The Guardian⁠
The Independent⁠
BBC News⁠
The Times⁠
The Telegraph⁠