The investigation into the death of inmate Robert Brooks at Marcy Correctional Facility is heading to the federal level.

The Federal Bureau of Investigation's Albany office says agents and members of the Department of Justice are reviewing the incident to determine what the federal response should be.

Lawmakers and advocacy groups have come out demanding changes following Brooks' death.

Body camera footage released last week by the New York Attorney General’s office shows correctional officers hitting Brooks while he was restrained at the prison on Dec. 9. He died the next day at a hospital in Utica. 

Attorney General Letitia James says her office will be investigating, using all its resources. 

So far, 13 staff members connected to the incident have been suspended without pay. Another staff member has resigned.

Brooks, a former resident of Greece, was serving a 12-year sentence for stabbing his girlfriend in 2016.

The Department of Corrections and Community Supervision (DOCCS), the office in charge of Marcy Correctional in Oneida County, is already making changes following the incident. That includes requiring correctional officers to have their body cams on any time they are interacting with an inmate and requiring senior leaders to be present for at least one hour per shift. An "officer of the day" will also be required to evaluate staff and inmates following any use of force incidents.

DOCCS says the agency is committed to doing much more to ensure the safety of staff and those in their care.