A mother and her 13-year-old daughter are in jail after they were charged with the first-degree murder of a popular 15-year-old track student named DeKayla Danberry, who was stabbed to death on Saturday evening. No one seems to know what caused the brawl that ended the teen’s life; only that it involved a huge group of young folk, and happened on Saturday at 7:30 p.m. in Parkway Gardens, a neighborhood on Chicago’s south side, according to police.

A video taken during the chaos is part of evidence that is being described as ‘overwhelming’ by Assistant Cook County State’s Attorney Christine Hake, who confirmed the daughter was charged in juvenile court on Tuesday.

At least one witness identified the 13-year-old girl, who is said to have stabbed the high school student, in the video.

While other witnesses claim to have seen the girl wiping blood off the knife and screaming in panic, “I killed her. I killed her!”

Tamika Gayden, 35, the girls mother, is said to have given her daughter the knife. Authorities charged Gayden with murder and contributing to the delinquency of a minor just hours later, police said.

Gayden’s daughter appeared in court in a navy blue detention jumpsuit and had brown hair past her shoulders, the Chicago Tribune reported. According to the paper, when the judge asked the seventh-grade student, who has never had any trouble with the law, if she understood the case being brought against her, she softly replied, “yes.”

DeKayla’s mother, Sheila Dansberry, was overwhelmed and cried and shook when she heard the prosecutor describe the events that happened on Saturday, according to a report by WGN-TV.

‘A 13-year-old girl. I don’t know what to say,’ she said after the hearing according to the Chicago Tribune.

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(Photo Source: ABC 7 Chicago)