Alberto Martinez, 46, was knocked to the ground and beaten by three inmates in the prison yard at Calipatria State Prison in Imperial County on Thursday, California Department of Corrections and Rehab

This November, California residents will weigh in on the use of forced labor in state prisons when they vote on Proposition 6.

Alberto Martinez, a convicted murderer who was involved in the Mexican Mafia, was attacked and killed by three inmates at Calipatria State Prison.

A homicide investigation is underway into the death of an inmate found unresponsive in his cell at Salinas Valley State Prison in Monterey County, officials announced Tuesday. California Department of Corrections and Rehabilitation officers were conducting security rounds when they made the discovery at 10:45 a.