ABC News contributor and a former FBI agent Brad Garrett speaks with us about the challenges law enforcement face with a case spanning several states and the only person of interest missing. SUBSCRIBE to GMA's YouTube page: https://bit.ly/2Zq0dU5 VISIT GMA's homepage: https://www.goodmorningamerica.com SIGN UP to get the daily GMA Wake-Up Newsletter: https://gma.abc/2Vzcd5j FOLLOW GMA: TikTok: https://tiktok.com/@gma Facebook: https://facebook.com/GoodMorningAmerica Twitter: https://twitter.com/gma Instagram: https://instagram.com/GoodMorningAmerica #GMA #GabbyPetito #BrianLaundrie #Investigators #LawEnforcement #FBI