Isabelle Rose Welsh, a two-year-old described as bright and bubbly with an infectious smile, had her life cut short after a campaign of "heinous abuse" at the hands of her mother Alexandra Walker and her partner Harrison Simpson. Following a violent assault, the tot collapsed from severe injuries at her home in Thornaby, near Middlesbrough, and died in hospital the next day.
Campaign of violence
Prosecutor Richard Wright KC told Teesside Crown Court: "For weeks this child had been violently assaulted, and her death - by that terrible head injury - was simply the end point in that campaign of violence to which she had been subjected." A post-mortem found Isabelle had suffered 21 broken bones in the weeks before her collapse, along with a catastrophic head injury, a shattered skull and brain damage. She had also been sexually assaulted.
This week, Walker and Simpson were sentenced to life imprisonment for murder, with minimum terms of 22 and 28 years respectively. Simpson was convicted unanimously, while Walker was convicted by a majority of 11 to one. Both were found guilty of child cruelty, and Simpson was also convicted of sexual assault of a child; Walker was cleared of that charge.
Warped relationship
The pair met on Facebook in the summer of 2025. Walker had concerns about Simpson, searching his name on the Sex Offenders Register, but ignored the signs. In messages to her mother, she described him as "a homeless romance scammer". Walker had previously been in an abusive relationship. Within weeks of Simpson entering her life, Isabelle's maternal grandmother noticed worrying differences, saying the tot, whose leg was broken, "looks like she is being abused."
Stacey Ashman, a therapist trained in forensic psychology, said: "Nobody falls in love faster than an abuser looking for their next victim. They're very, very quick with the love bombing, and if they figure out that somebody is already vulnerable... They know exactly what they're doing."
Hospital visit and collapse
On September 2, Walker took Isabelle to North Tees Hospital, claiming she had poked her leg through her cot. An X-ray showed a spiral fracture to her tibia that had been broken for days without treatment. Nurses were concerned, but Walker became aggressive, challenged the nurse, demanded another doctor and said she was taking her daughter home anyway.
Wright told the court: "The response of Walker was not the response that you might expect in a concerned mother who had just been informed that her daughter had a broken leg that had gone untreated for several days or weeks."
On September 13, Walker delayed calling 999 as Isabelle lay dying. She smoked a cigarette and Googled "why would my toddler be bleeding", then called her stepfather, who told her to dial emergency services. Paramedics found Isabelle covered in bruises, not breathing and cold to the touch. She died the following day.
Online facade
Online, Simpson posed as a family man, sharing posts about teaching children values, including a 32-point list of "rules to teach your son". Ashman said such predators "want to appear to be a great dad because what they're doing is they're micromanaging what everyone's vision of him is."
CCTV from cameras in the home laid bare the couple's dark life. Walker would drink up to 10 cans of Stella Artois, and Simpson habitually smoked cannabis. One image showed an intoxicated Walker jabbing herself with a knife while supposedly caring for Isabelle. CCTV also showed Isabelle suffered a broken leg while alone with Simpson, and that Simpson bathed her without permission while Walker was at a doctor's appointment.
Court denials
Both denied murder, allowing the death of a child, sexual assault and child cruelty, and blamed each other. Simpson's barrister, Nicholas Lumley KC, said it was "trotting out the old stereotype" to blame the man, not the woman. Walker's barrister, Mark McKone KC, argued she "would not and did not" harm Isabelle and was unaware of the abuse.
Ms Justice Norton told Walker she was "a fantasist and an attention-seeker" who had "lied from start to finish", adding: "Right to the very end, your interest was not in Isabelle, but in yourself." Simpson refused to answer police questions after his arrest and did not testify.
In a statement, Isabelle's family said: "Rest in peace Isabelle, fly high little girl. Forever two."
Help and support
Anyone affected by sexual assault can access help via www.rapecrisis.org.uk or by calling 0808 802 9999. Those aged 18 or under can contact Childline on 0800 1111 or the NSPCC Helpline on 0808 800 500. For mental health support, the Samaritans can be reached on 116 123.
