When the series premiered in September 2005, it featured FBI Agents Jason Gideon, Aaron Hotchner, Elle Greenaway, Derek Morgan, Spencer Reid, Jennifer "J. For season one, Garcia was not a main cast member, but rather had a recurring role, although she appeared in most episodes.
In 2006, at the start of season two, Lola Glaudini announced her departure from the show, as she wanted to return home to New York City.
Paget Brewster replaced her in the role of Emily Prentiss. Cook's son, Mekhai Andersen, has been written into a recurring role as Jennifer's son Henry.
He left letters of apology for his fellow cast members, explaining his reasons and wishing them luck. In season six, Jennifer is forced to accept a promotion at The Pentagon, causing her to leave the BAU. Although she survives, she does not appear for the rest of the season.
Joe Mantegna replaced him as David Rossi, a best-selling author and FBI agent who comes out of retirement. Cook and Brewster were both replaced by Rachel Nichols as Ashley Seaver, an FBI cadet.
CBS's decision to release Cook and Brewster from their contracts resulted in numerous fans writing angry letters to the studio and signing protest petitions.
CBS rehired Cook and Brewster as Jennifer Jareau and Emily Prentiss, respectively; Nichols was released.
Criminal Minds is an American police procedural crime drama television series created by Jeff Davis, and is the original show in the Criminal Minds franchise.
It premiered on September 22, 2005, on the broadcast network CBS, and is produced by The Mark Gordon Company, in association with CBS Television Studios and ABC Studios.Criminal Minds is set primarily at the FBI's Behavioral Analysis Unit (BAU) based in Quantico, Virginia.In accordance with the show's plot, Criminal Minds differs from many procedural dramas by focusing on profiling the criminal, called the unsub or "unknown subject", rather than the crime itself. Cook, Kirsten Vangsness, and Shemar Moore are the only actors to have appeared in every season.The show has an ensemble cast that has had many cast member changes since its inception. The series follows a group of FBI profilers who set about catching various criminals through behavioral profiling.The plot focuses on the team working cases and on the personal lives of the characters, depicting the hardened life and statutory requirements of a profiler.The show spawned two spin-offs: Criminal Minds: Suspect Behavior (2011) and Criminal Minds: Beyond Borders (2016).