Killing of Rachel Nickell

In a television interview on 7 September 2021 with Lorraine Kelly, discussing the documentary Death on the Common: My Mother’s Murder, Alex Hanscombe said after his mother had been attacked, he said to her three times "wake up Mummy" before realising she was "gone" and not playing. He then walked into a clearing on the common, where people saw that he was covered in blood and therefore discovered his mother's body.

Following an investigation, the Independent Police Complaints Commission (IPCC) released a report, dated 3 June 2010, into the actions of the Metropolitan Police Force and their handling of the murder investigation. It described a "catalogue of bad decisions and errors" by the Metropolitan Police which had resulted in Napper being free to kill Nickell. It said that officers missed a series of opportunities to take him off the streets and suggested the lives of Samantha Bisset and her four-year-old daughter, Jazmine, would also have been saved if police had acted on tip-offs, including one by Napper's mother.

In 2002, with more advanced forensic techniques, the case was reopened. On 18 December 2008, Robert Napper pleaded guilty to Nickell's manslaughter on the grounds of diminished responsibility. Napper, who was already detained at Broadmoor High Security Hospital in Berkshire for a 1993 double murder, was ordered to be detained there indefinitely.

Stagg sued the police for damages totalling £1 million following the fourteen months he spent in custody. He has co-written and published two books about the case: Who Really Killed Rachel? (with novelist David Kessler) and, more recently, Pariah (with journalist Ted Hynds), the latter being published on the same day as the real culprit's appearance in court to enter a plea. In January 2007, the Home Office confirmed that Stagg would receive compensation for wrongful prosecution, with the amount to be set by an independent assessor. On 13 August 2008, it was announced that the compensation was £706,000.

In July 2006, the Scotland Yard team interviewed convicted murderer Robert Napper for two days at Broadmoor. Napper, 40 years old at that time, had been diagnosed as having paranoid schizophrenia and Asperger syndrome and had been held at the secure institution for more than ten years. He had been convicted of the murder of Samantha Bisset and her four-year-old daughter, Jazmine, in November 1993, sixteen months after Nickell's homicide. On 28 November 2007, Napper was charged with Nickell's murder. He appeared at City of Westminster Magistrates' Court on 4 December 2007, where he was granted bail on condition he remained at Broadmoor psychiatric hospital until another hearing on 20 December 2007. On 24 January 2008, he pleaded not guilty to Nickell's murder and the trial started on 11 November 2008. On 18 December 2008, at the Old Bailey, Napper pleaded guilty to the manslaughter of Rachel Nickell on the grounds of diminished responsibility. Mr Justice Griffith Williams said that Napper would be detained indefinitely at Broadmoor because he was "a very dangerous man". It is unlikely he will ever be released. At the same time, Stagg received a public apology from the Metropolitan Police for their previous involvement and prosecution of him in regard to the Nickell murder investigation.

In 2002, ten years after the killing, Scotland Yard used a cold case review team, which used refined DNA techniques only recently made available. A small team of officers and retired veteran investigators analysed statements from witnesses, reassessed files on a number of potential suspects and examined the possibility that the case was linked to other crimes. Officers compared the injuries suffered by Nickell with other attacks and consulted forensic scientists about improvements in DNA matching. In July 2003, reports surfaced that, after 18 months of tests on Nickell's clothes, police had found a male DNA sample which did not match her boyfriend or son. The sample at the time was insufficient to confirm an identity, but was large enough to rule out suspects.

The criminal psychologist involved with the investigation was charged with professional misconduct by the British Psychological Society, but in 2002, in lieu of any substantive hearings, further action was dismissed due to the time delay in bringing proceedings.

Keith Pedder, the case's lead detective, received heavy public criticism. Even after Stagg was (rightfully as it later turned out) cleared of the murder of Nickell, Pedder continued over subsequent years to promote his theory that Stagg was guilty. He told an ITV Real Crime documentary in 2001:

The undercover officer involved in the attempt to obtain evidence in the original investigation by befriending him took early retirement from the Metropolitan Police force in 1998. With the support of the Police Federation, she sued the Metropolitan Police for damages arising from the investigation. In 2001, shortly before it was due to be heard, her case was settled out of court and she received £125,000. Her solicitor said: "The willingness of the Metropolitan Police to pay substantial damages must indicate their recognition that she sustained serious psychiatric injury". The payout was widely criticised by various sources, particularly as Nickell's son had been granted £22,000 (less than a fifth of the amount paid to the undercover detective) from the Criminal Injuries Compensation Authority.

André Hanscombe later wrote a book titled The Last Thursday in July about his life with Nickell, coping with the homicide, and life with their son afterwards. In 1996, he moved with their child to France, driven abroad, according to notes in his book, by media intrusion. He was strongly critical of some of the reporters who tracked him and his son down to his "sanctuary" in the French countryside.

When the case reached the Old Bailey in September 1994, Mr Justice Ognall ruled that the police had shown "excessive zeal” and had tried to incriminate Stagg by “deceptive conduct of the grossest kind". He excluded all the entrapment evidence on the grounds that Stagg's descriptions of the murder were not nearly as close to the reality as the police had maintained. With no other evidence to present, the prosecution withdrew its case and Stagg was acquitted.

At the time of her death, Nickell was living near Wimbledon Common with partner André Hanscombe and their two-year-old son, Alexander Louis. Nickell was 23 years old at the time of her death. On the morning of 15 July 1992, she and Alexander were walking their dog on Wimbledon Common. Whilst passing through a secluded area of the common, Nickell was attacked. An assailant killed her by repeatedly stabbing and slashing her with a knife, then sexually assaulted her. The assailant fled the scene, leaving Alex physically harmed in the vicinity. A passer-by found Alex clinging to his mother's body repeating the words "Wake up, Mummy".

Every year on the anniversary of the killing Scotland Yard came under pressure for progress. In the late 1990s, Nickell's murder was re-investigated as part of Operation Enigma, which was a national cross-force investigation into the unsolved murders of 207 women. Under new management, detectives began to collate evidence and files related to the case from 2000.

Rachel Cerfontyne of the IPCC said that police failed to investigate the 1989 report that he attacked a woman on Plumstead Common in London and no record of the telephone call can be found. She said, "It is clear that throughout the investigations into the 'Green Chain' rapes and Rachel Nickell's death there was a catalogue of bad decisions and errors made by the Metropolitan Police. The police failed to sufficiently investigate after Napper's mother called police to report that he had confessed to her that he had raped a woman and, inconceivably, they eliminated Napper from inquiries into the Green Chain rapes because he was over 6' tall. Without these errors, Robert Napper could have been off the streets before he killed Rachel Nickell and the Bissets, and before numerous women suffered violent sexual attacks at his hands". Detectives had decided to exclude anyone over 6' based on the description of a 5' 7" rapist; however, there were conflicting witness reports of the rapist's height, and Napper walked with a stoop. The IPCC said no police officer would face disciplinary action because they had all retired and one key senior detective had died. Criminal prosecutions were not considered.

Rachel Jane Nickell (23 November 1968 – 15 July 1992) was a British woman who was stabbed to death on Wimbledon Common in south-west London on 15 July 1992. The initial police investigation of the crime resulted in the arrest in controversial circumstances of an innocent man, who was acquitted. Her killer, Robert Napper, was identified by a later police investigation and convicted in 2008.