A US soldier accused of killing five fellow servicemen in Baghdad in Iraq three years ago will be arraigned at a military base in Washington.
The arraignment prepares the way for a trial that could result in the death penalty.
Sergeant John Russell is accused of going on a shooting rampage at Camp Liberty, near Baghdad airport, in 2009.
At the time, the military said the shootings could have been triggered by combat stress.
The soldier faces five charges of premeditated murder, one charge of aggravated assault and one charge of attempted murder.
Six months ago, he was ordered to stand trial in a military court empowered to assign the death penalty if convicted.
Two of the five people killed in the shooting were medical staff officers at the counselling centre for troops experiencing combat stress. The others were soldiers.
It is not known how Sergeant Russell will plead after hearing the charges against him.
No trial date has been set.