A Wyoming coroner said the 22-year-old's cause of death was strangulation and her body was in the woods three to four weeks before it was found. READ MORE: https://abcn.ws/2X9Nd5R 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 #GMA #GabbyPetito #BrianLaundrie