18-year-old Isabella Yun-Mi Guzman was arrested and charged last week with first-degree murder for allegedly stabbing her mother 79 times in the face and in the neck.
The arrest affidavit shows that Ms. Guzman had sent an email to her mother the day before the stabbing that said “you will pay.”
Ms. Guzman’s stepfather told police that in the days before the murder, the teenager had become “more threatening and disrespectful” toward her mother. Her mother had grown fearful of her and called the Aurora police a few hours before the murder.
The police came to the home and warned the teenager that her mother could kick her out if she did not change her behavior.
Just a few hours later, the authorities returned to the home to find Yun-Mi Hoy dead in the upstairs bathroom.
Ryan Hoy, Ms. Guzman’s stepfather, told authorities that he heard a “thumping” noise and his wife calling his name. The teenager was holding the bathroom door shut attempting to block him from coming in.
He immediately went to call the police and when he returned he saw his stepdaughter standing in the bathroom doorway with a knife and his wife’s nude body on the floor, covered in blood.
Mr. Hoy never heard his stepdaughter say anything. She didn’t speak to him as she left the bathroom. She was “staring straight ahead when she walked past him.”
Yun-Mi Hoy was stabbed 31 times in the face and 48 times in the neck.
There is no known motive for the killing but Isabella’s stepfather told authorities that she has been quite a challenge. When she was seven years old, she had been sent to live with her biological father because of her difficult behavior.
Ms. Guzman’s aunt described her as being a “typical teenager” but noted that she could get angry but was never violent. “Her mother spoiled her.”
She also described her demeanor as being “pretty sweet… but not violent like that.”
Her aunt speculates that there must be more to the story.
Below is video of her being brought into court. There is no sound but the video is very telling, especially at around 0:23 seconds.
It’s too soon to analyze the psychological aspects of the case because we know so little about the murder and about Isabella Guzman. We’ll have to wait until more information becomes available to determine what went wrong.