California Department of Corrections officials say a prisoner is suspected of killing his cellmate at California State Prison, Sacramento.
Sergio Castañeda III, 32, was found lying on his cell floor by a guard at the Folsom facility at around 10:12 p.m. Monday, according to correctional spokesman Lt. LeVance Quinn.
Castañeda was immediately moved to an on-site medical facility and Folsom Fire Department responded to the scene, according to a news release. Castañeda was pronounced dead at 10:51 p.m.
Investigators named his cellmate, Arthur Lane, as a suspect. Lane, 47, was placed in an isolated housing unit at the high-security prison.
Lane is serving a life sentence for a 2003 Sacramento County murder. According to the release, he had a four-year sentence added on from Kern County for assaulting another prisoner with a deadly weapon.
Castañeda was serving a three-year sentence for a Los Angeles County robbery, though four years were added on for battery on a non-prisoner in Monterey County in 2016. He previously served a two-year Riverside County sentence for injury to an elder causing death or great bodily injury.