The horrifying body camera footage of a Dallas police officer shooting and killing Jason Harrison—a mentally ill man who was holding a screwdriver when he was gunned down—has finally been made public.

According to the Dallas Observer, Harrison's mother had called police, as she had done many times in the past, seeking assistance getting her agitated, mentally ill 38-year-old son to the hospital. From the Dallas Morning News:

That day, Harrison's mother called 911 to ask the police for help bringing her son, who was bipolar and schizophrenic, to Parkland Hospital. He was in a crisis because he was off his medication, his family said.

In the 911 call, Harrison's mother described her son's mental disorders, and those details were relayed to the officers by dispatchers, Henley said. The video shows Harrison's mother walking calmly out of the house in the 200 block of Glencairn Drive seconds prior to the shooting.

The shooting recorded on officer Andrew Hutchin's body camera from last June was released yesterday by the attorney representing Harrison's family, Geoff Henley. Dallas police claim Harrison "became aggressive" when officers arrived at the home.

"He's just off the chain," Harrison's mother can be seen saying the video. "Bipolar-schizo," she goes on. Harrison then appears in the doorway holding a screwdriver in his hands.

Seconds later, officers Hutchins and John Rogers draw their weapons and shout, "Drop it!" And in a flash, they open fire, and Harrison is on the ground. The officers continue to shout at him to drop the screwdriver as he bleeds out.

Harrison is on the ground and dying in fewer than 30 seconds from the time police knock on his front door.

Following the shooting, both officers were placed on administrative leave for five days before returning to duty. Dallas Police Chief David Brown, the Observer reports, has maintained that the video supports "the officers' accounts that the shooting was justified."

An internal police investigation, the Morning News reports, is ongoing.

An edited (but still graphic) version of the video is embedded above. The full, 18-minute clip below: