Netflix film revisits evidence that led to Letby’s conviction and hears from expert who says his research was misused Netflix film revisits evidence that led to Letby’s conviction and hears from expert who says his research was misused Shortly after Lucy Letby was sentenced to 15 whole-life terms for murdering seven infants and attempting to murder seven others between June 2015 and June 2016 – a conviction that made her Britain’s worst ever child serial killer – Cheshire police agreed to give “