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 correspondent Jericka Duncan joins CBSN with the latest for "48 Hours." Watch "What Happened to Gabby Petito?" Saturday at 10/9c on CBS and Paramount+.
