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2019 • 6 Episodes
Season 1 of Mark of a Killer premiered on January 20, 2019
2020 • 10 Episodes
Season 2 of Mark of a Killer premiered on April 9, 2020
2021 • 14 Episodes
Season 3 of Mark of a Killer premiered on April 12, 2021
2022 • 4 Episodes
Season 4 of Mark of a Killer premiered on April 2, 2022