A convicted killer was brutally beaten to death by three other inmates inside a California prison, according to authorities. Alberto Martinez, 46, was knocked to the ground and beaten by three inmates ...

A convicted murderer was killed this week in an assault by other inmates at a Southern California prison, authorities said. Staff at Calipatria State Prison in Imperial County witnessed the beating ...

Two inmates in a California state prison are being investigated for the alleged murder of a third inmate in one of the facility’s yards on Sunday, officials with the California Department of ...

Add Yahoo as a preferred source to see more of our stories on Google. Alberto Martinez, 46 (pictured in mugshot), was behind bars in Calipatria State Prison for first-degree murder (California ...