See How the 'Criminal Minds' Cast Has Changed Since Their First Seasons (PHOTOS)
Matthew Gray Gubler as Dr. Spencer Reid in Season 1
Matthew Gray Gubler as Dr. Spencer Reid in Season 14
A.J. Cook as Jennifer "JJ" Jareau in Season 1
A.J. Cook as Jennifer "JJ" Jareau in Season 14
Kirsten Vangsness as Penelope Garcia in Season 1
Kirsten Vangsness as Penelope Garcia in Season 14
Paget Brewster as Emily Prentiss in Season 2
Paget Brewster as Emily Prentiss in Season 14
Joe Mantegna as David Rossi in Season 3
Joe Mantegna as David Rossi in Season 14
Daniel Henney as Matt Simmons in Season 10
Henney guest-starred in the backdoor pilot for the spinoff, Criminal Minds: Beyond Borders
in Episode 19. He joined the cast as a series regular in Season 13.
Daniel Henney as Matt Simmons in Season 14
Aisha Tyler as Dr. Tara Lewis in Season 11
Aisha Tyler as Dr. Tara Lewis in Season 14
Adam Rodriguez as Luke Alvez in Season 12
Adam Rodriguez as Luke Alvez in Season 14
The BAU looks quite different after 14 seasons of Criminal Minds — and not just because agents have come and gone over the years.
Only three of the team's members from Season 1 are still around: Matthew Gray Gubler's Dr. Spencer Reid, A.J. Cook's Jennifer "JJ" Jareau, and Kirsten Vangsness's Penelope Garcia. Paget Brewster joined as Emily Prentiss in the second season, and Joe Mantegna's David Rossi became part of the team a year later.
From the pilot to key episodes for Season 15, check out these must-see cases before the series says goodbye.
The rest of the agents — Dr. Tara Reid (Aisha Tyler), Luke Alvez (Adam Rodriguez), and Matt Simmons (Daniel Henney) — joined in the past few years.
Ahead of the CBS drama's final season, we're taking a look at how the stars have changed from their first seasons to the most recent. Click through the gallery above to see who looks the most different.
What should happen after JJ's confession in the Season 14 finale?
Criminal Minds, 15th and Final Season, Coming Soon, CBS