when does jj come back to criminal minds season 6
Jennifer Jareau Cook later returned for the departure of Paget Brewster (Agent Emily Prentiss).[8] In the episode titled "Lauren", JJ receives a call and returns to help the BAU find Emily and capture Ian Doyle. The episode ends with Emily presumed dead after being stabbed with a broken chair leg in the stomach. It is later revealed that Emily is alive and in Paris with JJ's help, providing her passports from three different countries and a bank account in each "to keep her comfortable". In the season six finale, JJ returns in order to tell David Rossi that she is "coming back".