Delano, California — A violent altercation at Kern Valley State Prison on Friday has resulted in the death of an inmate. The incident involved 46-year-old Julian Mendez, who allegedly became the target of a brutal attack by fellow inmate Mario Renteria, 36.
The confrontation reportedly began around 10:30 a.m. when Renteria initiated the assault on Mendez. According to officials from the California Department of Corrections and Rehabilitation (CDCR), prison staff quickly intervened, instructing the inmates to cease their actions. However, both inmates reportedly disregarded these commands.
Efforts to interrupt the attack escalated when officers deployed chemical agents, temporarily halting the violence. In a shocking turn, more than 30 additional inmates intervened, swarming Renteria and further complicating the situation. Despite repeated orders from prison staff to stop, the chaos continued, prompting the use of multiple blast grenades to restore order.
As medical personnel rushed to aid Mendez, he was transported to the prison’s medical facility, where a physician declared him dead at 11:05 a.m. Life-saving measures had been initiated immediately, but they ultimately proved unsuccessful. Authorities reported that an improvised weapon was recovered from the scene, though specific details regarding its nature remain unclear.
Following the incident, Renteria has been placed in restricted housing while an investigation is underway. CDCR officials have stated that the prison’s Investigative Services Unit is conducting a thorough inquiry into the events. Additionally, movement within the facility has been restricted to assist the investigation and ensure the safety of all inmates.
The Kern County District Attorney’s Office has also been notified, and the Office of the Inspector General is involved in the investigation. Meanwhile, the Kern County Coroner’s Office will determine the official cause of death for Mendez.
Mendez had been serving time since December 2004, following his transfer from Riverside County. He was previously convicted of serious offenses, including the first-degree murder of two teenagers in 2002. Renteria, who was transferred to Kern Valley State Prison in April 2022, has a separate conviction for first-degree murder with the possibility of parole, as well as arson.
Kern Valley State Prison, which opened in 2005, is designed to accommodate more than 3,100 inmates, ranging from minimum to high-security custody. The institution continues to deal with the ramifications of this tragic incident as investigations proceed.