An inmate who died earlier this week at the state prison was found to have passed away from natural causes, according to the state Department of Corrections.

Uno Kim, 64, was found to have hypertensive and coronary heart disease in an autopsy, authorities said.

Kim was found unresponsive just after midnight Monday. An ambulance was called and life-saving measures, including CPR and an automated external defibrillator, or AED, were used. However, these efforts were stopped when a do-not-resuscitate order was found in his records, officials said.

Kim was originally incarcerated on May 29, 2003 for two counts of first-degree murder.