This Jan. 8, 2014 photo from the California Department of Corrections and Rehabilitation shows inmate Hugo Pinell. Pinell, involved in a bloody 1971 San Quentin escape attempt that left six dead, has been killed by a fellow prisoner. The slaying of Pinell triggered a riot Wednesday, Aug. 12, 2015, at a maximum security prison east of Sacramento. (California Department of Corrections and Rehabilitation via AP)

This Jan. 8, 2014 photo from the California Department of Corrections and Rehabilitation shows inmate Hugo Pinell. Pinell, involved in a bloody 1971 San Quentin escape attempt that left six dead. (California Department of Corrections and Rehabilitation via AP)

SACRAMENTO, Calif. (AP) — California corrections officials say two inmates already serving life sentences are suspects in the slaying of Hugo Pinell, an infamous member of the “San Quentin 6” who spent 45 years in segregation after a bloody 1971 escape attempt at San Quentin State Prison.

Seventy-one-year-old Pinell was killed in August, days after he was released to the general prison population at a maximum security prison east of Sacramento.

On Friday, officials named inmates Jayson Weaver and Waylon Pitchford as suspects. No charges have been filed.

Weaver, age 38, is serving a San Diego County murder sentence and a Sacramento County life sentence for a previous prison assault.

Pitchford, age 37, is serving a life term for a Tehama County murder and a 12-year Sacramento County sentence for an assault behind bars.