Prosecutors have declined to file charges against a 16-year-old Federal Way girl who was arrested for fatally stabbing her mother’s boyfriend and then stabbing herself on July 26.

The Federal Way police investigation determined that the girl was acting in self-defense when she stabbed her mother’s boyfriend, 39-year-old Antron Lewis, of Seattle, during an argument. Lewis did not live at the apartment but visited overnight on occasion.

According to police investigation documents, the girl told police she was cooking Ramen noodles for breakfast in the kitchen of her mother’s apartment at Greystone Meadows when Lewis became angry and confronted her because he felt the teen was being too loud.

The teen punched the wall during the argument and told police she was going to leave, but she was unable to because Lewis came towards her and said, “B**** I’ll beat your a**,” the documents continue.

As the argument escalated, the teen’s mother came into the kitchen to try and intervene by standing in between the two. The mother told police that her boyfriend approached her “aggressively” and pushed her as he tried to get past her. The mother said Lewis pushed her with such force that she suffered an arm injury.

At this point, the girl armed herself with a knife from the kitchen to defend herself, as she perceived that Lewis was trying to hit her. Both the teen and her mother told police in separate interviews that Lewis then “lunged” towards the girl in the kitchen, according to police documents. As the teen raised her hands with the knife in one hand, the knife went into Lewis’s chest when he lunged at her. The girl was still holding the knife handle in her hand, but the blade had broken off into the man’s chest. He then walked towards the bedrooms where he collapsed on the floor, which pushed the knife blade further into his chest, the documents continue.

The teen told police she started to panic and she went to the kitchen, obtained another knife and stabbed herself in the stomach in an attempt to kill herself. The girl’s mother told investigators that the teen has a history of untreated mental illness and this was not the first time her daughter has attempted to harm herself.

The mother and Lewis’s family member both told investigators during separate interviews that Lewis “had a temper.”

Medics conducted CPR on Lewis, but were unable to revive him and he died at the scene. The girl was transported to Harborview Medical Center where she underwent surgery for her critical self-inflicted injury.