Cam showing New York correctional officers smirking as they "fatally beat" a man in handcuffs

NEW: Body-cam footage released showing New York correctional officers smirking as they "fatally beat" a man in handcuffs.

Sickening.

43-year-old Robert Brooks passed away on Dec 10 at Wynn Hospital in Utica, NY.

The New York Attorney General’s Office of Special Investigations has since launched an investigation, saying the "videos are shocking and disturbing."

Brooks was sentenced to 12 years in prison in 2017 for first-degree assault.

The incident followed a transfer where Brooks had been moved from Mohawk Correctional Facility to Marcy Correctional Facility on December 9.

Brooks could be seen being assaulted by the officers in what CNN describes as a "fatal beating." Audio of the tragedy was not activated.

It's unclear what exactly led up to the incident.

"As expected, watching the horrific and violent final moments of Robert’s life was devastating for his loved ones, and will be disturbing to anyone who views the video following its release by the Attorney General’s Office," Brooks' family said.

"We will not rest until we have secured justice for Robert’s memory, and safety for the prisoners at Marcy Correctional Facility."