Mother and boyfriend on trial for murder of toddler

A mother and her boyfriend are on trial for murder and sexual assault after a two-year-old girl suffered a fatal head injury and was found to have endured weeks of abuse, including fractures to 21 bones. The trial of Alexandra Walker, 25, and Harrison Simpson, 22, opened at Teesside Crown Court on Tuesday, June 23, 2026, where the prosecution alleged the toddler’s death was the culmination of a violent campaign.

Isabelle Welsh collapsed at her home on Hartington Close in Thornaby, Teesside, on September 13, 2025. Her mother called emergency services, and paramedics found the child at the foot of the stairs with no pulse, covered in bruises, and gravely ill. She was rushed to the hospital but died in the early hours of September 14.

Prosecutor Richard Wright KC told the jury that Isabelle’s death resulted from a massive head injury inflicted shortly before her collapse. He said she had been violently shaken, with her spine overextended and her head impacting a hard surface like a wall or floor. This fatal injury, Wright stated, was not an accident but a deliberate act of murder.

The prosecution’s case alleges the head trauma was the endpoint of sustained abuse. A post-mortem...