The Bay Area man was killed last week in a California prison where he'd been serving a life sentence for murdering a close friend, officials said.

Prop 6 seeks to amend the California Constitution to prohibit slavery and involuntary servitude as punishment for a crime, and authorize the Department of Corrections and Rehabilitation to award credits to incarcerated persons who voluntarily participate in work assignments.

David Leonardo, 39, was originally sentenced to 15 years to life for killing Priscilla Rose Hernandez in 2011.

Jason Corbett, a 52-year-old man from Paradise, was sentenced to life in prison for murder in aid of racketeering today, according to the California Department of Justice.

A homicide investigation is underway after Jacob Kober of Livermore was found unresponsive in his cell at the Kern Valley State Prison on Sept. 19. His cellmate, Matthew Perez, was also injured, according to officials.

State corrections officials have launched a homicide investigation after a convicted killer from Alameda County died following an incident at a Central Valley prison Thursday evening.

Jacob Kober, 35, was stabbed multiple times in his Kern Valley State Prison cell on Thursday, authorities said. His cellmate, identified as 39-year-old Matthew Perez, also sustained injuries consistent with a “prison manufactured weapon,

An inmate at Kern Valley State Prison died Thursday after an apparent attack with an inmate-manufactured weapon, his cellmate also suffering injuries, prison officials said. Jacob Kober, 35, was pronounced dead at 7:52 p.