Former British nurse Lucy Letby was found guilty this month of killing seven babies on a neonatal unit at a Chester hospital.

Letby, 33, was also found guilty of trying to kill six other infants between 2015 and 2016 at Countess of Chester Hospital, where she worked at the time, the BBC reported.

Prosecutors say Letby injected some of the babies with air, force fed some with milk, and poisoned two with insulin.

The first verdicts were read on August 8 after the jury deliberated for 76 hours. A second set of guilty verdicts were read on August 11.

Sky News reported that Letby refused to appear in court for some of the verdicts and will not appear on Monday when she is sentenced.

British media said the convictions made Letby, who has proclaimed her innocence throughout the 10-month trial, the United Kingdom’s most prolific child serial killer.

Letby testified in May that plumbing problems may have contributed to the babies’ deaths, as CrimeOnline reported.

Previous testimony linked Letby to the slaying of a 1.7-pound baby who reportedly had air forced into his stomach via a nasogastric tube. An expert testified that the boy was thriving at the time of his sudden death, saying that he was “potentially at risk of complications” after birth, and he was receiving routine treatment for pneumonia.

The expert concluded that pneumonia did not kill the newborn.

A pediatric consultant testified that he stopped Letby from killing a 98-minute-old baby, who was also born prematurely. The consultant reportedly caught Letby standing over the incubator as the baby’s oxygen levels plummeted. The consultant allegedly found the baby’s breathing tube was dislodged and that an alarm had been silenced.

Letby was acquitted on two attempted murder charges while the juror was unable to make a decision on four others.

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[Featured image: Lucy Letby/Handout]