A mother and her boyfriend have been sentenced to life imprisonment for the murder and abuse of a two-year-old girl in Thornaby, Teesside. Isabelle Rose Welsh died on September 14, 2025, following weeks of repeated physical and sexual assault, according to the findings presented during their trial at Teesside Crown Court.

Alexandra Walker, 26, and Harrison Simpson, 22, were convicted of murder and child cruelty. Simpson was additionally found guilty of sexually assaulting Isabelle; Walker was cleared of the sexual assault charge. Ms Justice Norton handed down minimum terms of 28 years and six months for Simpson and 22 years for Walker.

The court heard that Isabelle endured a sustained and severe campaign of violence leading up to her death. Medical examinations revealed 21 broken bones, 89 bruises, and evidence that she had been violently shaken and suffered a fatal head injury consistent with being struck against a hard surface. The final injury occurred on the morning of September 13, 2025, leaving the child with catastrophic brain damage from which she later died in hospital.

Paramedics arriving at the Walker home found Isabelle unresponsive at the foot of a staircase, with blood in her nappy and vomit on her face. Despite medical efforts, she succumbed the next day. A postmortem confirmed the extent of her injuries, including fractures and sexual assault.

The prosecution described the abuse as “sadistic” and characterized the fatal head trauma as the final act in a series of violent assaults. They highlighted that Isabelle had been a happy and healthy child prior to Walker’s relationship with Simpson, whom she met through Facebook Dating the previous summer. Evidence presented showed Walker had harbored suspicions about Simpson’s behavior, including searching the sex offenders’ register, but maintained the relationship despite concerns.

Walker had taken Isabelle to medical facilities 11 days before her death after the toddler was found to have a fractured leg; however, despite concerns from some healthcare professionals, the child was discharged back into Walker’s care. The judge noted that disagreements among medical staff and acceptance of Walker’s explanations contributed to missed opportunities that might have prevented Isabelle’s death.

During sentencing, Ms Justice Norton criticized Walker for a lack of urgency in seeking help on the day of the injury, noting that she waited over an hour after noticing bleeding before calling emergency services and had engaged in behaviors such as smoking and clearing evidence of drug use. Simpson provided no account of the events leading to Isabelle’s fatal injuries.

Family members, including Isabelle’s father Josh Welsh, were present at the sentencing. Welsh expressed the profound impact of the loss on his family and the significance of achieving justice for his daughter.

Cleveland Police Detective Chief Inspector Steve Chatterton described the case as one of the most harrowing his team had encountered. He emphasized that Isabelle was a “defenceless child whose life was cruelly taken from her” and underscored the importance of remembering her tragedy to prevent similar future cases.