As agent "Derek Morgan", he always tried to hunt down and lock up the worst of the worst. The "Criminal Minds" actor remained faithful to the show until the end of season 11 and then moved on to other projects. He had guest appearances in season 12 and 13, and now stars on the new CBS crime drama "S.W.A.T", based on the 1975 television series. The next picture will take you back to the year when "J.J.", played by Andrea Joy Cook first joined the show...