The Witness ending explained: What happened to André and Alex?

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Please be advised that this article discusses sensitive and potentially upsetting topics, including murder and sexual assault. Reader discretion is advised.

The Witness, a new three-part documentary series now on Netflix, tells the story of the aftermath of Rachel Nickell’s murder and its lasting impact on her son, Alex, and partner, André. It follows their years-long journey seeking justice.

The story follows André and Alex as they grapple with the death of Rachel, showing how they each cope with the loss in their own unique ways, and features both real people and characters created for the plot.

Facing relentless media attention, André chooses to move away with his son. The person responsible for the tragedy remains at large, and a mistake in the investigation has wrongly implicated an innocent man, making the situation even more devastating.

The last episode reveals how Rachel’s killer is finally apprehended, but the details are complex. Here’s a complete explanation of the ending of ‘The Witness,’ which is inspired by a disturbing real-life case.

The Witness ending explained: What happened to André and Alex?

The last part of The Witness begins in 2005, revealing that Robert Napper has been officially identified as Rachel’s killer. However, he’s been held at Broadmoor Hospital since 1995, serving time for a separate double murder and multiple rapes.

André is wary of trusting the police, particularly because they previously suspected the wrong man, Colin Stagg. He points out that the DNA evidence isn’t strong enough to be conclusive, and may never be. Adding to his skepticism is the fact that they haven’t even questioned a key person, Napper. Because of all this, André doesn’t want to get his hopes up and tells the police he needs solid proof before he’ll believe them.

André and Alex are still not getting along. Alex has been spending most of his time with his girlfriend, leaving André feeling isolated. Even when Alex returns home, André understands his son isn’t interested in updates on the investigation or the new suspect, but he shares the information anyway.

Detective Sergeant Ivan Agnew, back in the UK, questioned Napper’s old foreman, hoping work records would show if Napper was present on the day of the crime. After searching the foreman’s garage, Agnew discovered that Napper hadn’t worked at all on July 15th, 1992.

I was completely gripped by this scene – it shows Agnew and DCI Nash, played by James Bradshaw, heading to Broadmoor to interrogate Napper about Rachel’s murder. They hit him with the news that his DNA was found on her, but he just shut down, refusing to say anything at first, then simply denying any involvement. It was a really tense moment, and you could feel the frustration building.

After Napper revealed his mother had evicted him at 18, he became distressed and the interview was stopped by his lawyer and the doctor present. However, the detectives realized they could search the hospital with a warrant – something they couldn’t do in a prison. The search of the hospital and Napper’s possessions revealed boots matching the description given by a witness, along with a red toolbox.

Police discovered several small, red paint flakes in Alex’s hair during his examination. These flakes were delicate and could only be tested once. To successfully charge Napper with Rachel’s murder, they needed to definitively match both the paint and evidence from his boots. Fortunately, the test results confirmed a match, allowing them to charge Napper.

On Alex’s eighteenth birthday, André had an honest conversation with his son, urging him to confront the trauma he’s been avoiding, especially considering his mother’s killer is still at large.

After the police charge Napper, they contact André to let him know and ask if he plans to attend the trial. André wants to be there, but Alex doesn’t, and he can’t understand why their father would either. Soon after, with Napper held in custody but released on bail until the next hearing, the media discovers where André and Alex are living and swarms their home. André advises Alex to stay calm and tell his girlfriend about the situation before the story appears on Spanish television.

When André arrives at New Scotland Yard, Detective Chief Superintendent Nicholas Campbell (Sean Gilder) informs him that Napper had a prior record of minor crimes. Campbell warns that the media will probably exaggerate the story, but confirms the police knew about Napper before he murdered Rachel.

During the trial, André met Napper for the first time, and Napper admitted to manslaughter, explaining his actions were due to a mental condition. A doctor testified that Napper has paranoid schizophrenia and Asperger’s, and had shown signs of psychosis for years. Another psychiatrist explained that Napper believed he could read minds, thought the IRA had injured his knee, and believed he had magical powers, including the ability to regrow lost fingers – a delusion stemming from a past bomb incident.

The judge determined that Napper poses a significant danger to others and will remain in Broadmoor secure hospital indefinitely, unless experts are confident he no longer presents a risk. As he was being escorted away, Napper asked, “Will anyone apologize to the young boy?”

Campbell quickly brought André in to discuss the official statement, but André wondered why things had taken so long and why Napper hadn’t been detained, considering the police already knew about him. Following the trial, formal apologies were issued to Stagg, and the media widely reported on the mistakes made during the initial investigation.

Why does Alex travel back to the UK?

Alex is struggling to accept Napper’s apology after returning to Spain, and a conversation with his girlfriend leaves him wondering about Napper’s motivations. Later, Alex and Napper travel to London, where Alex meets with Dr. Monroe, one of Napper’s doctors. They talk, but Dr. Monroe explains she’s unable to share any information that hasn’t already been made public.

She details Robert’s difficult upbringing, describing a childhood marked by an alcoholic and abusive father. His Asperger’s syndrome wasn’t identified until later in life, which contributed to years of feeling alone. When he was 12, a family friend sexually assaulted him, and the attacker was charged with a crime. Dr. Monroe doesn’t understand why Robert began harming mothers and children, but believes he may have been acting out anger towards his own mother for his father’s abandonment.

She explains that he repeatedly hurt her by treating women as if they were mothers – a kind of nurturing he himself never received.

Dr. Monroe notes that while both Alex and Napper experienced difficult childhoods, the difference in how they remember the past suggests Alex felt secure and cared for. Alex clearly remembers his childhood, while Napper has very few memories.

When Alex returned home to Spain, he found his father reading documents sent anonymously from the Crown Prosecution Service. These documents revealed the police hadn’t shared all the information with them and detailed several missed chances to catch Napper. Notably, Alex’s mother had even called the police when Napper confessed to the rape, but the tip was never investigated.

Alex shared with André that Napper’s doctor confirmed Napper always had supportive people in his life – something André initially questioned. They both acknowledged they relied on each other for survival and agreed it’s time to concentrate on the positive things they’ve gained so they can move on.

The series concludes with actual footage of Rachel, André, and Alex. It finishes by revealing that André and Alex used the leaked CPS documents to file a lawsuit against the Metropolitan Police Service.

For information and support, please visit The Survivors Trust or Rape Crisis.

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The Witness is now available to stream on Netflix.

Authors

Morgan CormackDrama Writer

Morgan Cormack writes about TV and streaming drama for TopMob. Before that, she was an Entertainment Writer at Stylist. She also has experience in content marketing and freelancing, and holds a BA degree in English Literature.

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2026-06-04 14:39