Officials are investigating the death of a Northern California prison inmate as a homicide.
They said Friday that guards found 38-year-old Tou Thao lying unresponsive on the floor of his cell Thursday at California State Prison, Sacramento. He was pronounced dead at an outside hospital.
They've identified his cellmate, 45-year-old Jose Negrete, as a suspect. He is serving a life sentence from San Mateo County for kidnapping and a variety of violent sex crimes.
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Thao was serving a six-year sentence from Butte County for a violent second-degree robbery. The high-security prison east of Sacramento houses about 2,100 inmates.