The Arizona Department of Corrections is investigating the death of inmate Joseph S. Zawacki, 46, as a possible homicide.
According to a media release, officers attempted life-saving measures on Zawacki when they found him unresponsive. Paramedics pronounced Zawacki deceased.
Zawacki returned to ADC custody in 2010 to serve a 13-year sentence out of Maricopa County for forgery and armed robbery, according to a media release.
He was assigned to the Rincon Unit at Arizona State Prison Complex in Tucson.
The investigation of Zawacki's death is ongoing, and DOC intends to pursue criminal prosecution of any suspect(s) identified in this case.