Brianna was born on 7 November 2006. She had been diagnosed as a teenager with ADHD, autism and anxiety, and at school she did not attend regular lessons; she worked one-on-one in an inclusion room. Her mother later told the court that the autism made it harder for her daughter to recognise dangerous situations. Brianna danced and mimed to pop songs on TikTok and her following grew quickly, reported variously at 11,000, 31,000 and as many as 63,000. She was funny, the friends who spoke at her funeral said, and she was kind, and she was figuring out how to be herself in a part of England where being a transgender teenage girl meant being targeted. She had told friends she was being bullied at school; the headteacher disputed this in a statement her family approved. The texts she sent on her last afternoon ended with the message, sent to a friend at 2:30 pm, that something about the girl she was meeting felt wrong.

Two classmates were arrested the next morning. They were Scarlett Jenkinson and Eddie Ratcliffe, both fifteen. Jenkinson had met Brianna in Birchwood's inclusion room. The prosecution at Manchester Crown Court showed that Jenkinson had tried four months earlier to poison Brianna with ibuprofen, hoping the death would be mistaken for a suicidal overdose; Brianna had survived, though her mother thought she had appendicitis. Ratcliffe bought the hunting knife. The text messages between them showed a planning process that the trial judge, Mrs Justice Yip, eventually called sadistic in nature. The jury convicted both on 20 December 2023 after just under five hours of deliberation. On 2 February 2024, Yip sentenced Jenkinson to a minimum of 22 years and Ratcliffe to a minimum of 20, both detained at His Majesty's pleasure. The court found that the primary motive was sadism. Yip added that hostility toward Brianna's transgender identity was a secondary motive for Ratcliffe.

Outside the courthouse after the verdict, Brianna's mother Esther Ghey asked the public to extend empathy to the families of her daughter's killers. It was not the response the cameras expected and not the one most parents would have given, and Esther kept giving it. In March 2024 she met Jenkinson's mother. Both of us are mothers, she told her, trying to navigate something that nobody should ever have gone through. She launched a campaign to put mindfulness training into Warrington schools, raised £80,000 in the first year, and then took it national, lobbying for mindfulness teaching in every school in England. By February 2024 her petition for a smartphone ban for under-sixteens had more than 90,000 signatures. In 2025 she published a memoir, Under a Pink Sky, and an ITV documentary aired about her work. The work continues.

In the days after Brianna's death, candlelight vigils gathered in cities across the United Kingdom and in Dublin. Many drew crowds in the thousands. Hundreds attended her funeral at St Elphin's in Warrington. A GoFundMe set up by her friends raised £70,000 in three days and eventually £100,000, much of it given to a children's mental-health charity. Some of the UK press coverage was criticised by trans advocacy groups, and the LGBTQ radio station Gaydio coordinated a minute's silence across the country at 11 am on 17 February. Brianna's death certificate, when finally issued, recorded her correct name and female gender. In the third quarter of 2023 a coroner accepted that no Gender Recognition Certificate was needed to do so, a small precedent that mattered. A year later more than a thousand people gathered at Golden Square Shopping Centre in Warrington for the anniversary vigil.

Culcheth Linear Park follows the line of the old Wigan-to-Glazebrook railway, closed in 1964 and reopened in the 1970s as a foot and cycle path. It is the kind of quiet green corridor that runs through suburban Cheshire by the hundred, a place where neighbours walk dogs and children take shortcuts home from school. After 11 February 2023 a no-fly zone had to be declared above it to stop drones from circling. Today the park is much as it was: trees, the gravel path, the bench. The mindfulness programme Esther Ghey is fighting for would, if it succeeds, sit somewhere in the curriculum of every school within sight of it. The name on the slate at St Elphin's is the one Brianna chose. Her family have asked that this be the part of the story people remember.