Hotch's unexplained absence quickly becomes apparent when the team is called back together to profile a killer who is targeting an emergency room doctor.
When a disturbed man kills several people at a pharmacy, the BAU must figure out what triggered his actions before he hurts anyone else.
A case in Rossi's hometown has his personal and professional lives overlapping.
The team profiles a group of killers who travel as a pack and chose victims randomly.
The team hunts a suspect who impregnates young women and has them give birth before murdering them.
The BAU team tracks a serial killer who keeps the eyes of his victims as souvenirs.
The team tracks a serial killer who seems to follow the touring schedule of a goth rock star and the team suspects that the performer has become lost in his own stage persona.
A serial killer who murders entire families is tracked, and the team seeks advice from one of the most vile criminals from the past, "The Fox".
The Reaper returns to terrorize Hotch and his family.
While Agent Hotchner takes a leave of absence from the BAU, the team must regroup to solve a home-invasion case.
The BAU must profile a criminal's past in order to catch him after he escapes from custody and begins a killing spree.
An unusual personal obsession is at the center of a BAU abduction case; Hotch struggles with his return to work.
The team investigate a spate of teen suicides.
The team profiles a con artist whose descent into mental illness is prompting him to kill people involved in his scams.
A serial killer slashes his victims in public places, hoping to cause widespread fear.
The BAU profiles a child abductor who may have been keeping children for more than eight years.
The team profiles a truck driver who abducts women.
Hotch and the team investigate the murders of homeless men in San Francisco, and they work with a separate BAU group handling a case that may be connected to the deaths.
The BAU team heads to Texas to track a serial killer targeting illegal immigrants attempting to make safe passage into the U.S.
The BAU team must profile a serial killer covered in tattoos who commits suicide, but leaves clues to the whereabouts of his last victim.
Garcia travels with the team to Alaska for a case involving several murders, and plays a critical role in solving the crimes.
The team profiles a serial killer who finds his victims through social-networking sites.
The team travels to Los Angeles to find a serial killer who attacks entire families and leaves only one member alive.