Jennifer "JJ" Jareau is a Supervisory Special Agent who was the BAU's former liaison with police and media officials. Upon her return in Season Seven, she officially becomes a profiler while her original position has gone to Aaron Hotchner (until his departure from the BAU) and Penelope Garcia. For a time, she was the acting unit chief of the BAU, taking over as Emily Prentiss was placed on suspension, pending an investigation by Assistant Director Linda Barnes and was briefly terminated.