Officials discovered the body of Matthew Joseph Arterburn around 6:30 a.m. on Saturday.
Sheriff Greg Magee says the death does not appear to be from natural causes; officials are awaiting results of an autopsy.
Arterburn started serving a sentence for child pornography charges on July 15. The jail had been waiting on paperwork to sendArterburnn to a state prison to serve his sentence.
The Nebraska State Patrol is investigating the death.