A former soldier likely committed suicide in prison where he was serving several life terms for gunning down four members of an Iraqi family while he was deployed to their country.
The case was the first prosecuted under a new law governing military cases in civilian courts.
Stahley said Green’s death is being investigated as a suicide.
Green was a private in the 101st Airborne Division based at Fort Campbell on the Kentucky-Tennessee state line when he deployed to Iraq.
Green and three other soldiers went to the home of an Iraqi family in Mahmoudiya, near a traffic checkpoint in March 2006. At the home, Green shot and killed three members of the al-Janabi family before becoming the third soldier to rape 14-year-old Abeer Qassim al-Janabi before killing her. He was convicted and sentenced in 2009.