Is The Witness based on a true story? The real Rachel Nickell case

What happened

On 15 July 1992, 23-year-old Rachel Nickell was walking with her two-year-old son Alex on Wimbledon Common in southwest London. In broad daylight, she was attacked and stabbed 49 times. Alex was found by passers-by, clinging to his mother's body.

The series doesn't focus on the crime itself. Instead, it tells the story of the aftermath — through the eyes of Rachel's partner André Hanscombe and their son Alex. It's adapted from Alex's 2017 memoir Letting Go, and both he and André served as consultants on the production.

The investigation that went wrong

The Metropolitan Police initially suspected a local man named Colin Stagg. What followed was a deeply controversial operation:

• A female officer posed as a romantic interest, trying to coax a confession through intimate letters
• Stagg was charged in 1993 and spent 13 months in custody
• A judge cleared him in 1994, deeming the entrapment tactics unacceptable
• He later received over £700,000 in compensation

The real killer, meanwhile, remained free.

How the case was finally solved

The case went cold for nearly a decade. Then in 2002, advances in DNA analysis changed everything:

• Forensic scientists re-examined evidence from the crime scene
• The DNA matched Robert Napper — a convicted attacker already detained at Broadmoor Hospital for the 1993 murders of Samantha Bisset and her four-year-old daughter Jazmine
• In December 2008, Napper pleaded guilty to Rachel's manslaughter on the grounds of diminished responsibility
• He remains at Broadmoor indefinitely

That's over 16 years between the crime and the conviction.

Where are Alex and André today?

André raised Alex largely on his own. The two left the UK to escape the media attention. Alex now works as a yoga teacher and has spoken publicly about forgiving his mother's killer — saying he'd made peace with it long before Napper was even identified.

Netflix also released an accompanying documentary, The Murder of Rachel Nickell, on the same day — featuring archival footage and interviews with both Alex and André.

The Witness stays close to the facts. It's a difficult watch, but it's ultimately about grief, healing, and the bond between a father and son — not a typical true-crime thriller.