New court documents provide more details into the death of inmate Robert Brooks at Marcy Correctional Facility, who was allegedly killed by multiple correction officers, officials said.

In the documents, an investigator with the Department of Corrections who viewed the body-worn camera says it shows a number of correction officers physically assaulting Brooks on Dec. 9 while he was restrained inside a medical examination room at Marcy, an all-male medium-security facility in Oneida County. Brooks was ultimately taken to Wynn Hospital in Utica where he died the following day.

The documents say an official cause of death is still being determined but notes that the medical examiner's preliminary findings show concern of asphyxiation due to neck compressions.

The state attorney general's office is expected to release video of the attack by the end of this week.

Gov. Kathy Hochul previously called for 14 individuals who work at Marcy to be fired for their involvement in Brooks' death. The former resident of Greece was serving a 12-year sentence for stabbing his girlfriend in 2016.

Documents detailing the attack: