The Criminal Minds actress has signed up to star in the upcoming season 14 opener, states The Hollywood Reporter.
Brewster will play the head of the Public Integrity Unit at the District Attorney's office in the two-hour premiere on Wednesday, September 26.
The episode will see her character dealing with the case against Captain Cragen (Dann Florek), who is under suspicion of murder after he woke up by the side of a dead woman in the season 13 finale.
Previous guest stars Laura Benanti, Pippa Black, Peter Jacobson, Ron Rifkin, Brooke Smith and Dean Winters will also appear in the premiere episode.
Paget Brewster quit Criminal Minds after 125 episodes earlier this year.
She will also lend her voice to the upcoming Fox comedy Working Class Hero.