It’s a murder mystery that has divided America, pitted armchair sleuths against seasoned detectives and turned a spotlight on how the media treats victims of crime. The case of 22-year-old tragic blogger Gabby Petito and her fiancé Brian Laundrie, who went missing weeks after returning home alone from their camper van road trip, has turned both into the internet sensations they dreamed of becoming - but at the ultimate price.