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The investigation was conducted (2006 – ...)

2006 • 21 seasons • Documentary, Mystery
IMDb7.6/10240TMDB81%19Rotten Tomatoes—Metacritic—
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On September 23, 2026
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7397th by Pulse TV show online
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Seasons — The investigation was conducted

Season 1

32 episodes · Jan 20, 2006 · 7.6

Season 2

36 episodes · Jan 19, 2007 · 7.0

Season 3

32 episodes · Jan 18, 2008 · 7.1

Season 4

26 episodes · Feb 6, 2009 · 7.0

Season 5

32 episodes · Jan 22, 2010 · 7.2

Season 6

30 episodes · Jan 22, 2011 · 7.0

Season 7

35 episodes · Jan 29, 2012 · 7.1

Season 8

34 episodes · Jan 19, 2013 · 7.8

Season 9

33 episodes · Feb 1, 2014 · 8.0

Season 10

35 episodes · Jan 31, 2015 · 8.0

Season 11

33 episodes · Feb 7, 2016 · 8.0

Season 12

35 episodes · Jan 29, 2017 · 8.0

Season 13

36 episodes · Feb 4, 2018 · 7.8

Season 14

36 episodes · Feb 3, 2019 · 7.9

Season 15

36 episodes · Feb 2, 2020 · 7.8

Season 16

36 episodes · Feb 21, 2021 · 8.0

Season 17

36 episodes · Jan 23, 2022 · 7.9

Season 18

36 episodes · Jan 28, 2023 · 8.0

Season 19

36 episodes · Jan 28, 2024 · 8.0

Season 20

36 episodes · Feb 1, 2025 · 9.0

Season 21

21 episodes · Jan 31, 2026 · 9.0