Corrections spokeswoman Dana Simas says the slaying of 71-year-old Hugo Pinell triggered a riot Wednesday involving about 70 inmates at a maximum security prison east of Sacramento.
She says Pinell was targeted by another inmate on an exercise yard.
Eleven other inmates were taken to an outside hospital to be treated for stab wounds.
Forty-four years ago, Pinell helped slit the throats of San Quentin prison guards during an escape attempt that led to the deaths of three guards, two inmate workers and escape ringleader George Jackson.
Jackson was a Black Panther leader who was fatally shot as he ran toward an outside prison wall.
California State Prison-Sacramento Inmate Homicide Victim Identified as Hugo Pinell: Pinell was part of infamo... http://t.co/Wq3AbfQMqR— CA Corrections (@CACorrections) August 13, 2015