Officials at a state prison in Los Angeles County say they are investigating the death of an inmate from Redding as a homicide and his cellmate is a suspect. The Department of Dorrections said Monday that 39-year-old Rashelle Clarke was found unresponsive in his cell Saturday at the prison in Lancaster. It says prison staff immediately began lifesaving measures and called an ambulance. Clarke died 38 minutes later. Clarke was serving a 22-year sentence after being convicted in 2010 for endangering the health of a child. Clarke was arrested in 2009 along with Cassandra Sotelo after a Redding Police school resource officer noticed injuries on two children. Investigators found all seven of their children had injuries. Their ages ranged from 2 through 5. Officials say Clarke's cellmate, 33-year-old Leron Morris, is considered a suspect. Morris was convicted of first-degree murder in 2005 and is serving a life sentence with no parole.