The family of Joseph Mendoza has sued California’s prison authorities after he was stabbed nearly 180 times at Salinas Valley State Prison, with footage of the attack later circulated online.
Mendoza, 36, died on 8 April 2025 after he was attacked by fellow inmates Edgar Frayre and Nicolas Young in a day room at the Soledad prison in Monterey County.
His relatives allege that correctional officers failed to intervene effectively, delayed medical assistance and allowed video of the killing to be shared outside the prison. They say the footage was how the family discovered the extent of Mendoza’s death, around three months after the attack.
Family alleges guards failed to protect inmate
The wrongful-death and civil rights case was filed in the US District Court for the Northern District of California in December 2025. It names the California Department of Corrections and Rehabilitation, senior officials and prison staff as defendants.
According to the complaint, Mendoza had asked to be moved into protective housing after prison staff found him with a substantial quantity of drugs in January 2025. The family alleges that he instead remained in the general population and was identified to other inmates as an informant.
Lawyers for the family claim staff members watched as Frayre and Young repeatedly attacked Mendoza with improvised weapons. They further allege that nobody summoned medical help quickly enough and that evidence from the incident was not properly preserved.
The complaint also alleges that someone inside the prison recorded the assault, apparently by filming prison surveillance footage on a mobile phone, before it was posted on social media. The identity of the person who obtained or distributed the video has not been established.
Adanté Pointer, one of the family’s lawyers, said the footage appeared to have originated inside the prison and called for those responsible to be identified. Ismael Mendoza, Joseph’s father, said the family wanted steps taken to prevent another prisoner’s loved one from being returned home in a coffin.
Prison officials dispute account of attack
California’s corrections department has denied the allegations of wrongdoing in court. The agency has said staff observed the assault at about 5.39pm, issued repeated orders for the attackers to stop and used several less-than-lethal measures before the incident was brought under control.
Its account states that medical assistance was started, but Mendoza was pronounced dead at 6.10pm. Frayre and Young were taken to restricted housing while the prison’s investigative unit and the Monterey County District Attorney’s Office examined the killing.
CDCR identified Mendoza’s attackers in an official statement issued on the day of his death. The department has declined to comment in detail on the family’s lawsuit, citing the ongoing litigation, and has not publicly identified anyone accused of leaking the footage.
The case remains active. In an order dated 22 October 2026, a federal judge dismissed the family’s California state-law claims with permission to amend them, while allowing the federal claims to continue. The family was given until 12 November 2026 to file an amended complaint.
Mendoza had been in prison since 2009 and was serving a sentence of more than 26 years for robbery and attempted murder, with additional convictions relating to possession or manufacture of a weapon in prison and battery. His father said he had hoped to become an illustrator of children’s books after his release.
