Nearly four years after Gabby Petito’s remains were discovered in Wyoming’s Bridger-Teton National Forest, Netflix is set to release a new docuseries into the shocking murder of the #vanlife vlogger by her then-fiancé, Brian Laundrie.

American Murder: Gabby Petito will dig into Petito’s and Laundrie’s final days together, as well as the abusive underside of their seemingly pristine, social media-ready life. “Gabby and Brian seemed like a loving couple,” one person says in the new trailer. “But behind the scenes, they would get into arguments… The happiest people on social media,...