The 21-year-old woman who killed her father and seriously injured her mother on Tuesday said she had planned the murder beforehand. She said he had verbally abused her for years.

An acquaintance of the woman told the newspaper 20 Minuten that she had told her circle of friends on several occasions in the past that she wanted to kill her father. However, the threats were not taken seriously.

Other former classmates said Andrea S., as the killer is identified in the media, claimed to have kept a “death list” and had made death threats against a teacher.

Andrea S. rode her bicycle to her parents’ residence in Beringen, in Schaffhausen, early on Tuesday morning. She entered the apartment with her own key and, using a kitchen knife she had brought with her, stabbed her 52-year-old father who was sleeping on the couch to death.

When her mother came to try to help her husband, Andrea S. stabbed and wounded her severely. She then fled the scene.

A brother, who was sleeping at the residence at the time, took his mother to the hospital where she was treated.

Andrea S. was apprehended by police shortly after the crime and has admitted to the killing.

She is considered an introverted individual, prone to angry outbursts and aggression, according to acquaintances and neighbours. She wore black clothing exclusively and had expressed an interest in Satanism on several websites, including on her MySpace page.

“Something wasn’t right about her,” a neighbour told the newspaper Blick. “She was always dressed in black and wore t-shirts with Satanic symbols on them.”

Under questioning, police reported that the young woman said her father had verbally abused her for years. Because her mother had never done anything to stop the insults, she attacked her as well. 

She had not lived with her parents for several years and rarely visited them.