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(Lincoln, NE) -- The Nebraska Department of Corrections is reporting that a 20-year-old inmate, Isaac Serrano-Dominguez, died Thursday at the Tecumseh State Prison in Johnson County. The cause of death is currently unknown. Serrano-Dominguez was serving a four-to five-year sentence on charges of being an accessory to first-degree assault and robbery in Douglas County. A grand jury will conduct an investigation into the death, as is the case whenever an inmate dies in custody.