A chilling surveillance video released Friday shows the moment a 23-year-old Ukrainian refugee was fatally stabbed in a random attack aboard a Charlotte light rail train.

Iryna Zarutska, who had fled war-torn Ukraine in search of safety and a new life in the U.S., was riding the Lynx Blue Line on the evening of August 22 when the attack occurred, according to the Charlotte-Mecklenburg Police Department (CMPD).

Footage provided by the Charlotte Area Transit System (CATS) shows Zarutska boarding the train around 9:46 p.m., dressed in her pizzeria work uniform. She is seen quietly using her phone, unaware that danger was near. Just four minutes later, 34-year-old Decarlos Brown Jr. is seen allegedly pulling out a folding knife and stabbing her multiple times, including at least once in the neck.

Photo of Iryna Zarutska. — Iryna Zarutska was stabbed three times, at least once in the neck, police said. GoFundMe

After the attack, the video appears to show Brown walking calmly through the train, removing his sweatshirt and waiting by the doors as other passengers began to notice blood on him. Zarutska, bleeding heavily from the neck, collapsed in her seat and died at the scene.

Brown exited the train at the next stop, where police later recovered a folding knife. He was taken to a hospital for treatment of a hand injury before being arrested and charged with first-degree murder.

Transit security personnel were on the train at the time but were located in a separate car when the incident occurred. CMPD reported a police response time of approximately six minutes.

Brown, who is homeless, has a lengthy criminal history dating back to 2011, including convictions for robbery with a dangerous weapon, larceny, and communicating threats. He previously served five years in prison. Earlier this year, he was arrested for misusing 911 services. In that incident, police said Brown made unusual claims about a “man-made” material inside his body controlling his actions.

Memorial card for Iryna Zarutska with her photo, and the information for her wake and funeral — A GoFundMe page launched by Zarutska’s family said she had recently arrived in the U.S. from Ukraine, hoping for a fresh start. GoFundMe

In response to the tragedy, CATS officials announced during a September 2 transit meeting that they had appointed a new chief safety and security officer, significantly increased their safety budget, and begun upgrading surveillance equipment across the system.

A fundraiser for Zarutska described her as someone whose life was “tragically cut short far too soon.” The investigation into the attack remains ongoing, and police have not yet determined a motive.