Army Sgt. Matthew J. Jones, 37, died Monday at a hospital in Fort Campbell, Ky., after a short illness.
He was the first to die in Iraq, the Army said.
The military said Jones died of complications related to a chronic illness.
Jones served as an infantryman in the 1st Battalion, 2nd Infantry Regiment, 3rd Infantry Division, from 2006 to 2009.
He graduated from West Point in 2007 and earned a bachelor’s degree in political science.
He served as a sergeant in the Army Reserve from 2006 until his deployment to Iraq in 2011, according to the Army.
He died at the age of 37, the spokesman said.
He had been stationed in Iraq since January 2011, the army said.
Jones was deployed to Afghanistan from March 2009 to October 2011, as a member of the 1/8th Armored Regiment, 2d Brigade Combat Team, 3d Infantry Division.
He received the Army Commendation Medal for his work in Afghanistan and Iraq.
Jones had been deployed to Iraq since 2009, when he was in Iraq as part of a unit that was part of the 2nd Brigade Combat Unit.
He earned the Army Achievement Medal for outstanding service to the United States and the Army Meritorious Service Medal for distinguished service.
The Associated Press contributed to this report.