FORT MADISON, Iowa (AP) – Authorities say a 74-year-old sex offender has died at the Iowa State Penitentiary medical unit in Fort Madison.

A state news release says Jack Franks was found unresponsive, without a pulse or heartbeat, in his bed at 3:20 a.m. Sunday. The release says that because Franks had signed a do-not-resuscitate order, no attempt to revive him was made.

The release says Franks suffered from several conditions, including coronary artery disease. Franks was serving a 20-year sentence that began in July 2005.

He’d been convicted in Pottawattamie County of four counts of lascivious acts with a child.