Officials at Mule Creek State Prison in Ione are investigating the death of a prisoner as a suspected homicide.
The incident occurred about 7:25 p.m. Monday after inmate Gregory Miley was attacked by another inmate during the evening yard program, according to a California Department of Corrections and Rehabilitation news release.
Miley was escorted to the prison medical facility, where he was evaluated and medically cleared to return to his housing unit. But Miley returned to the prison medical facility and became unconscious about 9:07 p.m. He was airlifted to a nearby hospital.
At 4:10 p.m. Wednesday, Miley was removed from life support and pronounced dead, officials said.
Miley was received by the Department of Corrections and Rehabilitation on Feb. 16, 1982, from Los Angeles County to service a life sentence with the possibility of parole for first-degree murder. On Nov. 11, 1983, he was charged with another murder and again sentenced to life with possibility of parole, this time out of Orange County.
In both cases, officials said, Miley was convicted for his role as an accomplice to William George Bonin, known as the “Freeway Killer,” in the death of two boys, ages 14 and 12, in Los Angeles and Orange counties.