The BAU must determine what caused a disturbed man to murder several people at a pharmacy before he harms anyone else.

As Rossi, Morgan and JJ profile a killer who is targeting an emergency room doctor, Prentiss realizes that Hotch is missing.

The BAU continues its search for a serial killer who has forced the team into Canada to catch him and has placed a team member’s life in danger.

In one of its most difficult cases, the BAU is called to Detroit to help track down a serial killer who forces the team into Canada to catch him.

The BAU responds quickly after a serial killer releases a new strain of a deadly virus that threatens the public, which puts a member of the team at risk.

Local authorities summon the assistance of the BAU after a series of homicides occur that appear to have been caused by a serial killer’s car near Bend, Oregon.

A serial killer sends the team a videotape recounting one of his murders–and also asking for help to stop killing. Vincent: Alex O’Loughlin.

A serial killer preying on children is in custody, but the case takes a twist when it’s discovered that one of the murders may have been committed by someone else.

The BAU is called to Texas to investigate a serial killer who is targeting vacationing students on spring break on South Padre Island.

The BAU is summoned to Indiana by local authorities when a serial arsonist threatens the residents of a small town by setting fire to community meeting places that kills several people.