ATLANTA  — A white police officer in Georgia that shot an unarmed, naked, mentally ill black veteran pleads not guilty on Monday.

Former DeKalb County Police Officer Robert Olsen plead not guilty to all charges in shooting death of Anthony Hill.

Olsen shot and killed Hill in March 2015 after responding to a 911 call. Hill, who was naked and acting erratically at the time, lunged at Olsen prior to the shooting.

Hill, an Air Force veteran, had struggled with mental illness since returning home from war.