A senior detective tells Sky News how his team went about building a case to prosecute Lucy Letby. Sky's Data and Forensics unit looks at the evidence the police had and how it pointed to the nurse as the killer. The 33-year-old was convicted of murdering babies while working at the Countess of Chester Hospital between June 2015 and June 2016. Full story: https://news.sky.com/story/how-the-police-caught-lucy-letby-12933640 #lucyletby SUBSCRIBE to our YouTube channel for more videos: null Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com/ and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Sky News Daily podcast is available for free here: https://podfollow.com/skynewsdaily/ Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí: https://www.youtube.com/channel/UCzG5BnqHO8oNlrPDW9CYJog To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales