Tags: Television Season.
The sixth season of Criminal Minds premiered on CBS on September 22 2010 and ended May 18 2011. A.J. Cook appeared as a series regular for two episodes and as a special guest star in two episodes due to contract negotiations. Paget Brewster was a regular for eighteen episodes but returned in the seventh season premiere. Rachel Nichols appeared as a guest star for two episodes and was then promoted as a regular but departed after the season finale.