(KLZA)-- The Nebraska Department of Corrections has announced that an inmate at the Tecumseh State Correctional Institute died Wednesday.

68-year-old Frank Hardy was serving a 75 – 95 year sentence on Gage County charges including first degree sexual assault of a child, third degree sexual assault of child and visual depiction of sexually explicit conduct. 

Hardy has been in prison since May, 2011.

The cause of death has not been determined.  Hardy was being treated for a long-term medical condition. 

Whenever an inmate dies in the custody of the Nebraska Department of Correctional Services, a grand jury will conduct an investigation into the death.