Authorities have identified the victim and suspect involved in a fatal assault at a Florence prison Saturday. 

Corrections officers at the Corrections Corporation of America, a private prison, saw 43-year-old Roberto Venegas-Fernandez assault his cell mate, 55-year-old Michael Patrick McNaughton during an inspection Saturday morning, according to a news release from the Pinal County Sheriff's Office. 

Corrections officers entered the cell and subdued Venegas-Fernandez, the release said. 

McNaughton was pronounced dead at the scene. 

Both men, who are from the San Diego area, were transported to the prison from a Southern California facility Friday night and neither men expressed any concern about being housed together, the release said. 

The men were being held in the Florence prison pending their transfer to the Federal Bureau of Prisons.