Kentucky ? An Army officer was sentenced to 25 years in prison by a military jury Saturday for shooting and killing an Iraqi detainee during an interrogation.

First Lt. Michael Behenna of Edmond, Okla., was convicted a day earlier of murder and assault, but acquitted of making a false statement. He had faced up to life in prison.

“We are disappointed at the jury’s verdict and the sentence,” Behenna’s attorney Jack Zimmermann said.

Zimmermann said he has filed a motion for a mistrial, claiming prosecutors withheld evidence that could help Behenna’s defense. The judge has scheduled arguments on the motion Monday, Zimmermann said.

Behenna testified he was trying to defend himself when he shot Ali Mansour Mohammed and that the detainee reached for the officer’s gun in a secluded railroad culvert near Beiji, Iraq, in May.