This marks the first time Letby has been questioned under caution regarding her training period at Liverpool Women's Hospital, where concerns about her actions first emerged.

A public inquiry, known as the Thirlwall Inquiry, is underway to investigate how these deaths went unnoticed and to review the hospital's response to concerns raised about Letby prior to her arrest.

The inquiry will examine systemic failures in care at the Countess of Chester Hospital and is expected to continue until early 2025, with findings anticipated by late autumn of that year.

Dr. Stephen Brearey, a senior pediatrician, suggested that Letby may have harmed more infants than those for which she was convicted, indicating that her harmful actions likely began prior to her first confirmed victim in June 2015.

Letby has attempted to appeal her convictions, which have faced scrutiny from some scientists and legal experts regarding the evidence presented at her trial, although her appeals have been rejected.

Concerns have been raised about the timing of renewed police inquiries, with Letby's lawyer, Mark McDonald, suggesting it may influence public perception amid evidence undermining her convictions.

Prosecutors detailed Letby's methods of harming infants, including injecting air into their bloodstreams and tampering with feeding and breathing tubes.

The inquiry revealed that incidents of deteriorating health among babies during Letby's shifts should have prompted earlier investigations, as the frequency of unexplained incidents increased during her time at the hospital.

Lucy Letby, a 34-year-old nurse serving a whole-life sentence for murdering seven infants and attempting to kill seven others, is currently being questioned in prison about additional suspicious baby deaths at Countess of Chester Hospital and Liverpool Women's Hospital.

Despite her convictions, Letby maintains her innocence as investigations into her actions continue.

Cheshire Police are reviewing the care of approximately 4,000 babies who were admitted during Letby's tenure from January 2012 to June 2016, including her placements at Liverpool Women's Hospital.

Key witnesses in the inquiry include barrister Louis Browne KC, former Senior Coroner for Cheshire Alan Moore, and cultural change advocate Helene Donnelly.