British nurse Lucy Letby was able to murder seven newborns because of a “complete failure” to protect babies at the hospital at which she worked, and some of the deaths could have been avoided, the chair of an inquiry says. ↧ Some of U.K. nurse Lucy Letby’s murders could have been stopped e... Letby, 36, was convicted in 2023 of murdering seven babies and attempting to murder six others, making her Britain’s most prolific serial child killer of modern times.