SUSANVILLE, Calif. (AP) – An inmate at a High Desert State Prison has been stabbed to death by another inmate who used a handmade weapon. The state Department of Corrections and Rehabilitation says 53-year-old Douglas Maynard succumbed to his injuries after being attacked at High Desert State Prison in Susanville Saturday. Investigators identified 39-year-old Robert Stockton as a suspect in the attack, which occurred on a recreation yard. He was serving a life sentence for first-degree murder and use of a firearm. Maynard was also serving a life sentence. Officials said he was initially serving time for first-degree burglary, but while in prison he was convicted of assault by a prisoner with a deadly weapon and several other charges. The prison in Lassen County houses about 3,500 minimum-, medium- and maximum-security inmates.