LEXINGTON — An investigation is underway after an 18-year-old male inmate was found unresponsive Friday night at the Dawson County Jail during a cell check.

Medical aid was rendered, a paramedic unit was notified and the inmate was transported to Lexington Regional Health Center, where he was pronounced dead, according to a joint press release from the Dawson County Sheriff and Dawson County Attorney. The two agencies have not yet released the name of the inmate.

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The South Central Area Law Enforcement Services investigation unit was activated and investigators from the Kearney Police Department and the Buffalo County Sheriff’s Office have been assigned to investigate the incident. An autopsy also has been scheduled. Under Nebraska law, a grand jury must be convened whenever a person dies while in the custody of a law enforcement officer or detention personnel.