SCOTTSBLUFF, Neb. -- A man from Scotts Bluff County died while serving his sentence.

Officials said a 26-year-old man died on Saturday at the Nebraska State Penitentiary (NSP). They have not determined his cause of death at the moment. A grand jury will do the investigation.

NSP said the inmate was serving a 26- to 46-year sentence that started Feb. 27, 2018. He had been charge for theft by unlawful taking, use of a deadly weapon to commit a felony and assault on a peace officer. All of the charges came from Scotts Bluff County.