At that time, homicide investigators say inmate Mario Renteria, 36, from Riverside County, allegedly began attacking the death row inmate, identified as Julian Mendez, 46.

Mendez had been incarcerated at the prison since Dec. 2, 2004, after being sentenced to death in 2002 for the first-degree murder of two teenagers in Riverside County.

Mendez had been incarcerated at the prison since Dec. 2, 2004, after being sentenced to death in 2002 for the first-degree murder of two teenagers in Riverside County.

Mendez had been incarcerated at the prison since Dec. 2, 2004, after being sentenced to death in 2002 for the first-degree murder of two teenagers in Riverside County.

Kern Valley State Prison violence in California leaves death row inmate Julian Mendez dead in attack involving multiple inmates, prompting investigation by prison officials and district attorney.