(KLZA)-- An inmate at the Tecumseh State Correctional Institution died Wednesday evening at the Johnson County Hospital.

The Nebraska Department of Correctional Services report says 65-year-old Robert Mahler was serving 50 – 81 years on two counts of vehicular homicide and second-offense driving under the influence. He had been sentenced in Dixon County.

A cause of death has yet to be determined.

It is required that a grand jury conduct an investigation anytime an inmate dies in custody in Nebraska.