Nathan Simpson, 30, was last seen at about 9:30 p.m. at Delta Conservation Camp, located east of Suisun City on Lambie Road near state Highway 12, according to the state Department of Corrections and Rehabilitation.
Simpson is described as a white man with a thin build, fair complexion, brown hair and brown eyes. He is 6 feet 1 inch tall and weighs around 150 pounds. He was last seen wearing orange-colored jeans and shirt with the initials CDCR printed on the back.
Simpson was sentenced to the CDCR in May 2010 after being convicted of vehicle theft with priors in Siskiyou County, according to the CDCR.
Authorities were continuing to search for the fugitive at 2 a.m. Anyone who has seen Simpson or has knowledge of his whereabouts should dial 911.