OTTAWA, Kan. (AP) – The Kansas Bureau of Investigation is looking into the death of a 35-year-old inmate at an eastern Kansas jail.

Authorities said Benjamin F. Mastel, of Ottawa, Kansas, was found unresponsive in his cell at the Franklin County jail late Friday night. He was rushed to a hospital where he was pronounced dead.

The sheriff’s office says Mastel had been in the jail since April 19.

The Kansas City Star reports court records show Mastel was being held on charges of aggravated battery and theft.

State law requires the KBI to investigate such deaths.