urb.

Court records allege Gayden jogged toward the 17-year-old with her arm raised. The encounter was captured on video from a CTA bus.

A witness who was stopped in southbound traffic told investigators he saw Gayden reach into her tote bag and remove a small object before lunging toward the 17-year-old, who ducked and moved away, according to court records.

Gayden then allegedly grabbed the 7-year-old by the back of her shirt, pulled her toward the ground and began stabbing her.

CTA surveillance video captured Gayden making a stabbing motion, and the witness also reported seeing the attack, according to court records.

The 17-year-old screamed for help as the girl ran toward her with blood running down her back before collapsing into her arms, court records state. Gayden was then seen attempting to put the knife back into her bag as multiple witnesses called 911 and tried to help the girl.

After the stabbing, Gayden walked away, but multiple witnesses approached her and tried to prevent her from leaving, asking why she had stabbed the girl, according to court records.

At least one witness struck Gayden while trying to prevent her from leaving, causing her to fall to the ground, court records allege.

When officers arrived, they attempted lifesaving measures on the girl before she was taken to a hospital, where she died a short time later from stab wounds to her back.

Officers found Gayden unconscious on the sidewalk. She was also taken to a hospital, where court documents state she became combative with medical staff.

Police recovered the knife allegedly used in the attack from the sidewalk.

What's next:

Gayden was released from the hospital and appeared in court Friday for a detention hearing.

She is charged with first-degree murder and was ordered detained pending her next court appearance, scheduled for Oct. 26.