TECUMSEH, Neb. (AP) – Authorities say an 82-year-old inmate has died at the Tecumseh prison in southeast Nebraska.

The Nebraska Correctional Services Department says Jerry Hansen died Saturday evening. He started his sentence on May 20, 1965, at the age of 28.

His cause of death has not been determined. State law requires a grand jury investigation whenever someone dies in custody or while being arrested.

Prison records say Hansen was serving two sentences of 10 years to life in prison for second-degree murders in Saunders County. He’d also been convicted of two counts of shooting with intent to kill, wound or maim.