FORT CAMPBELL, Ky. ? One of four U.S. soldiers accused of raping a 14-year-old Iraqi girl last spring and killing her and her family pleaded guilty Wednesday, and agreed to testify against the others.

Spc. James P. Barker agreed to the plea deal to avoid the death penalty, said his civilian attorney, David Sheldon.

The military judge presiding over the case, Lt. Col. Richard Anderson, asked Barker why he participated in the attack in Mahmoudiya, a village about 20 miles south of Baghdad. It was among the worst in a series of alleged attacks on civilians and other abuses by military personnel in Iraq.

“I hated Iraqis, your honor,” Barker answered. “They can smile at you, then shoot you in your face without even thinking about it.”

Anderson accepted the plea agreement, which calls for Barker to serve at least life in prison. The judge will decide in a hearing Thursday whether Barker should be allowed to seek parole.

Sgt. Paul E. Cortez, 24, and Pfc. Jesse V. Spielman, 22, members of the 101st Airborne Division with Barker, also are charged in the case. Cortez deferred entering a plea during his arraignment Wednesday morning. Spielman will be arraigned in December. The fourth soldier, Pfc. Bryan L. Howard, 19, deferred entering a plea at his arraignment in October.

A fifth person, former Army private Steve Green, 21, pleaded not guilty last week to civilian charges including murder and sexual assault.

Green was discharged from the Army for a “personality disorder” before the allegations became known, and prosecutors have yet to say whether they will pursue the death penalty against him.

The group is accused of raping the girl and burning her body to conceal their crimes, then killing the girl’s father, mother and 6-year-old sister.

Barker said he, Green and Cortez raped the girl, and Green killed the girl, her parents and her sister.

Barker did not name Spielman and Howard as participants in the rape and slayings, though he said they were at the house when the assault occurred and had come knowing what the others intended to do.

Under military law, soldiers who are present when a crime is committed can be charged with that crime even if they did not play an active role.

Cortez, who could face the death penalty if convicted, and Howard watched from the audience as Barker described the assault. They were accompanied by their defense attorneys and declined to comment.