<P> Cook later returned for the departure of Paget Brewster (Agent Emily Prentiss). 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". </P> <P> In "200", it was revealed that JJ's transfer was a backstop and that she was actually put on a task force in the Middle East with Mateo Cruz (who later became the section chief of the BAU following Strauss's death). During this time, she witnessed a mission she had pushed for fail and discovered one of the task force's informants dead . In February 2011, while overseas, she discovered that she was pregnant . However, in April 2011, following the events of "Lauren", during an attack on the task force, she was wounded and miscarried the baby . She didn't initially tell Will of the pregnancy, and it remained a secret between her and Cruz . In "The Forever People", when she starts showing signs of PTSD, Reid calls her on it, and he tries to help her and talk to her . She eventually admits she had a miscarriage due to the attack on her convoy, and asks him to keep it between them . </P> <P> The season seven premiere reveals that JJ has returned to the Behavioral Analysis Unit, having received the training to become a full - time profiler, instead of the Media Liaison, a position which has been split between Hotch and Garcia . </P> <P> She is initially against summoning Prentiss "back from the dead," but Hotch insists on telling the team the truth . Also, she learns Reid is emotionally hurt by her deception, as she knew he cried for ten weeks after losing Prentiss and she never said a word, and Reid revealed he considered taking Dilaudid again . </P>

In what episode of criminal minds does jj come back