Season 1 Investigation Discovery , 2016 - 2017 Watch now Season 2 Investigation Discovery , 2017 - 2018 Watch now Season 3 Investigation Discovery , 2018 - 2019 Watch now Season 4 Investigation Discovery , 2019 - 2020 Watch now Season 5 Investigation Discovery , 2021 Watch now Season 6 Investigation Discovery , 2022 Watch now Season 7 Investigation Discovery , 2023 Watch now