-The Devil's Business
The crimes of Charles Manson and his followers are detailed in the fourth-season opener.
-Most Likely to Succeed
The crimes of serial killer Herbert Mullin are recalled.
-Angel of Death
Recalling the case of an English nurse who was convicted of murdering four children and attacking nine others.
-The Gay Slayer
A serial killer who targeted gay men is profiled.
Investigating the murder of a family in Wichita.
-The Deadly Duo
A pair of Los Angeles serial killers are profiled.