48 Hours Season 35 Episode 2 What Happened to Gabby Petito? ( Air Date 2021-09-25 ) Genre News, Crime, Documentary category. Overview "Gabby Petito documented her road trip cross-country with her fiance before she was reported missing on September 11th. Now her fiancé, Brian Laundrie, is a person of interest in the case. CBS News national correspondent Jericka Duncan investigates.".