Voice Sitting News Today

>> reporter: but there was one more piece of evidence hidden at the ranch. a voice sitting in a secret vault that would shock even rebecca. coming up -- an audio recording reveals the darkest discovery of all. >> it will just rock you. it is so horrible. >> when "dateline" continues. what can i du with less asthma? with dupixent, i can du more....beginners yoga. namaste... ...surprise parties. aww, you guys. dupixent helps prevent asthma attacks... ...for 3!... ...so i can du more of the thing...