A US marine has been charged with murdering an unarmed detainee in Iraq, the US military said.
Sgt Ryan Weemer is the third marine to be charged in connection with the November 2004 incident, which happened during heavy fighting in Falluja.
Sgt Jermaine Nelson and Squad Leader Josť Nazario also face charges over the alleged killing of unarmed captives.
Sgt Weemer, 25, who is based at Camp Pendleton, California, has also been charged with dereliction of duty.
The charges were brought following a navy investigation after Sgt Weemer reportedly revealed details of the killing while taking a polygraph test for a Secret Service job.
He is accused of shooting an unknown man, who was being held by US forces during Operation Phantom Fury, says the BBC's Rajesh Mirchandani in California.
Map showing Falluja
If found guilty, Sgt Weemer faces life in prison.
He was a member of Kilo Company, 3rd Battalion, 1st Marines, based at Camp Pendleton, who allegedly killed several unarmed Iraqi captives being held captive in an abandoned house in Falluja.
The city was the scene of fierce fighting between insurgents and forces led by US marines in April and November 2004.
Although he had completed his active duty, the Marine Corps reactivated Sgt Weemer's service in order for him to be tried by a military court.
Sgt Nelson also faces a court-martial having been charged with murder last August.
Squad Leader Nazario faces federal manslaughter charges as he had completed his military service when the case was brought.
Four different members of the same unit face charges ranging from manslaughter to dereliction of duty for an incident in November 2005.
That case involves the alleged killing of 24 civilians in the town of Haditha, in Anbar province, north-west of Baghdad.
Click to view image: '164004-_42474270_falluja_nov04_ap203b.jpg'
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