| JJoshua BarbourSelf - Host | Self - Host |
| GGabby PetitoSelf - Murder Victim (archive footage) | Self - Murder Victim (archive footage) |
| BBrian LaundrieSelf - Gabby's Fiancé (archive Footage) | Self - Gabby's Fiancé (archive Footage) |
| NNichole SchmidtSelf - Gabby's Mother | Self - Gabby's Mother |
| JJim SchmidtSelf - Gabby's Stepfather | Self - Gabby's Stepfather |
| JJoe PetitoSelf - Gabby's Father | Self - Gabby's Father |
| TTara PetitoSelf - Gabby's Stepmother | Self - Gabby's Stepmother |
| AAngie AngersSelf - Reporter, Bay 9 News Florida | Self - Reporter, Bay 9 News Florida |
| PPatricia McKnightSelf - Reporter, Sarasota Herald Tribune | Self - Reporter, Sarasota Herald Tribune |
| AAli StagnittaSelf - Reporter, Hollywood Life | Self - Reporter, Hollywood Life |
| BBevan HurleySelf - Foreign Correspondent, The Independent | Self - Foreign Correspondent, The Independent |
| BBrent ShavnoreSelf - Social Media Sleuth | Self - Social Media Sleuth |
| SSteven BertolinoSelf - Laundrie Family Lawyer | Self - Laundrie Family Lawyer |
| PPei-Sze ChengSelf - Investigative Reporter, NBC 4 | Self - Investigative Reporter, NBC 4 |
| RRiley LivelySocial Media Influencer | Social Media Influencer |
| BBrent BlueSelf - Teton County Coroner (archive Footage) | Self - Teton County Coroner (archive Footage) |
