By most accounts, Lucy Letby lived an unremarkable life. She took salsa dance classes in her free time and frequently volunteered for overtime at her job as a neonatal nurse. But as more infant deaths began occurring at the Countess of Chester Hospital in England, Letby’s behavior and possible role drew intense scrutiny.Following her years-long legal saga, Letby is now grouped among the most unsettling killers in Great Britain’s history.Netflix’s new documentary The Investigation of Lucy Letby, which starts streaming on Wednesday, February 4, examines the horrifying case, which resulted in Letby’s conviction for the murder of seven infants in her care and the attempted killings of eight others. The documentary also includes new analysis of the events leading to Letby’s arrest and trial.Details of the case drew comparisons to that of Beverley Allitt, a British nurse crudely dubbed the “Angel of Death” and convicted of murdering three infants and an 11-year-old boy.…