On August 7, 2013, it was announced that characters Wayne Rigsby and Grace Van Pelt, played by Owain Yeoman and Amanda Righetti, both of whom had been on the series since the first episode, would be leaving.Casting is currently underway for two new series regulars, FBI Agents Kim Fischer and Nick Abbott.
                             - http://en.wikipedia.org/wiki/The_Mentalist_(season_6)

It's just Sad , I can't Imagine the series without them :(

                                                                                                              
                                                                                           Zakaria Moutchou