California ? The Marine Corps dropped charges and gave full immunity Friday to a serviceman who was accused of involuntary manslaughter in a squad’s killing of 24 Iraqis in Haditha in 2005.

The case against Lance Cpl. Stephen Tatum, 26, of Edmond, Okla., was dismissed as jury selection was about to begin for his court-martial. The government has been seeking Tatum’s testimony against the squad leader, Staff Sgt. Frank Wuterich of Meriden, Conn.

Prosecutors say Wuterich directed the assault immediately after a roadside bomb killed one Marine and wounded two others in a convoy. Wuterich and another Marine shot five men nearby before the squad leader ordered his men to clear homes with grenades and gunfire, killing unarmed civilians.

In February, Tatum received an order to testify against Wuterich and an unrequested immunity order that said anything to which he testified would not be used against him in his court-martial.

On Friday, a new immunity order was issued, along with the dismissal of charges.

“Lance Cpl. Tatum will testify truthfully if called as a witness,” said his attorney, Jack Zimmerman.