Lee, a 24-year-old college student, killed his parent who had abused him for his entire life. Lee’s case can be regarded as a typical example of domestic violence ending up with extreme violence. Most of the characteristics of juvenile killers (Heide, 1992) are evident in Lee's case. His relationship with his parents were filled with conflict and anger and he had struggled with a tremendous feeling of tension, developing the idea that his parents are obstacles who ruined his life and the only way to resolve his inner tension is to kill them. His offense involves expressive aggression, which occurs in response to anger-inducing conditions. He had prepared to commit violence prior to the crime which can be seen by his behaviors such as preparing weapon and arranging the time of the offense. In terms of criminal responsibility, he is responsible for his offense as he did know the nature and quality of the act he was doing and did know he was doing what was wrong.