According to Nick Albonico, spokesman for CDCR, the incident began when two inmates attacked a third inmate on a maximum-security yard at the prison.
Albonico said the inmate victim was knocked to the ground and the two attacking inmates kicked him in the head and stabbed him several times with an inmate-made weapon. Despite the victim losing consciousness, the attacking inmates ignored repeated orders to stop their attack.
The fatally wounded inmate, whose name is being withheld pending notification of his next of kin, was serving an 82-year-to-life sentence from San Diego County for first-degree murder.
The other inmate involved in the assault was not injured.