On May 4th, Danny Cabrera, 30, and Thomas Ellison, 61, were involved in a fight in a housing unit of the Fishkill Correctional Facility.
The inmates were separated by staff and returned to their assigned cells.
A short time after the incident, Ellison complained of head pain and was treated at the Fishkill infirmary.
He was then transferred to Saint Lukes Hospital in Newburgh, where he lost consciousness and was admitted to the ICU.
On Tuesday, Ellison died as a result of a head injury.
An autopsy was conducted on Wednesday, and Ellison’s death was ruled a homicide.
Ellison was serving a seven year sentence for Attempted Murder. Cabrera is serving six to eight years for Assault and Criminal Contempt.
Investigation into the incident is ongoing.