LONDON, United Kingdom – A British woman convicted of the murder of seven newborn babies, between 2015 and 2016, has lost her bid to appeal her conviction.

Lucy Letby, a former neonatal nurse, through her lawyers asked the Court of Appeal in London for approval to challenge the conviction of attempted murder of a newborn girl known as Child K.

According to the British media, Letby’s legal team argued that the retrial, which was granted back in July, should not have gone ahead due to the “overwhelming and irremediable prejudice” generated by coverage of her first trial.

But three senior judges reportedly dismissed the claim.

“We conclude that the judge was right to find that Letby would be able to have a fair trial,” they said.

The jury found Letby, 34, guilty of attempting to murder the baby girl at the hospital’s neo-natal unit. She received a life-term sentence on that charge. That decision came nearly a year after a different jury found her guilty of murdering seven newborn babies and attempting to kill six others at the Countess of Chester Hospital in northwest England.

That conviction made her Britain’s most prolific child serial killer in modern history.

She was earlier this year refused permission to challenge those convictions.