A Killer on Floor 32 takes you inside the deadliest mass shooting in modern American history using never before seen footage, and exclusive access to tell the story of that tragic night in Las Vegas. WATCH THE LATEST DOCUMENTARY HERE: https://bit.ly/2EOTJT0 #ABCNews #Documentary SUBSCRIBE to ABC NEWS: null Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOK https://www.facebook.com/abcnews FOLLOW ABC News on TWITTER: https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE: https://www.goodmorningamerica.com/