Season 1 Investigation Discovery , 2020 Watch now Season 2 Investigation Discovery , 2021 Watch now Season 3 Investigation Discovery , 2021 Watch now Season 4 Investigation Discovery , 2022 Watch now Season 5 Investigation Discovery , 2023 Watch now Season 6 Investigation Discovery , 2023 Watch now Season 7 Investigation Discovery , 2024 Season 8 Investigation Discovery , 2024