Season 1 Investigation Discovery , 2016 Watch now Season 2 Investigation Discovery , 2017 Watch now Season 3 Investigation Discovery , 2018 Watch now Season 4 Investigation Discovery , 2019 Watch now Season 5 Investigation Discovery , 2020 Watch now Season 6 Investigation Discovery , 2020 - 2021 Watch now Season 7 Investigation Discovery , 2021 - 2022 Watch now Season 8 Investigation Discovery , 2022 Watch now Season 9 Investigation Discovery , 2022 - 2023 Watch now Season 10 Investigation Discovery , 2023 Watch now Season 11 Investigation Discovery , 2023 - 2024 Watch now Season 12 Investigation Discovery , 2024