Nothing definitive is known about the Zodiac's background since he was never caught.
Individuals who engage in mission-oriented serial killing often exhibit characteristics of antisocial personality disorder, characterized by a disregard for the rights of others, lack of empathy, and a pattern of behavior that violates societal norms. Additionally, they may display traits of psychopathy, such as manipulation and deceitfulness, which can contribute to their ability to plan and carry out their crimes in a methodical manner.
In addition to be a murderous insane person, he clearly dealt with Gender Identity Disorder.
The Killer - 2008 I is rated/received certificates of: USA:Approved
The Killer - 1993 is rated/received certificates of: Belgium:KT
The Killer - 2006 is rated/received certificates of: India:A
bleach,weed killer and waste water treatment
Killer - 2000 is rated/received certificates of: Sweden:15
Portraits of a Killer - 1996 is rated/received certificates of: USA:R
Fugitive Killer - 1974 is rated/received certificates of: USA:R
Killer Pad - 2008 is rated/received certificates of: USA:R
Killer Flick - 1998 is rated/received certificates of: USA:R
The Minstrel Killer - 2009 is rated/received certificates of: USA:R