LOUISVILLE, Ky. (CBSDFW.COM/AP) — A former Fort Campbell soldier convicted of raping and killing a teenage Iraqi girl and using a shotgun to kill her family has died in prison in Arizona.

Federal Bureau of Prisons spokesman John Stahley says the death of 28-year-old Steven Dale Green of Midland on Saturday morning is being investigated as a suicide.

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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 in Mahmoudiya, Iraq, in March 2006. Green killed three members of the al-Janabi family before becoming the third soldier to rape 14-year-old Abeer Qassim al-Janabi. Green then shot her.

The other soldiers are serving sentences in the military prison at Fort Leavenworth, Kansas.

(©2014 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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