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California Department of Corrections and Rehabilitation (CDCR) officials are investigating after a death row inmate was killed at Kern Valley State Prison in Delano on Friday.

Convicted murderer Mario Renteria, 36, allegedly started beating fellow inmate, Julian Mendez, 46, at about 10:30 a.m. Friday, prompting prison staff to respond.

Officers ordered them to get down, but the men failed to comply, according to a CDCR news release obtained by Fox News Digital.

Chemical agents initially stopped the attack, but more than 30 additional inmates rushed Renteria and began striking him.

ESCAPED CALIFORNIA INMATE WHO KILLED LEADER OF ELITE MEXICAN POLICE UNIT WHILE ON THE RUN HAS BEEN ARRESTED

Orders to stop were ignored, and

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