The Fayetteville Observer reports sheriff's office lawyer Ronnie Mitchell said Andrew Michaelis was using rounds which are illegal to possess.
Michaelis fired bullets from what authorities said was an AR-15 assault rifle into his father-in-law's house on July 30. He discharged a 30-round magazine while shooting from his truck, killing his father-in-law and the man's 10-year-old grandson before he died in a shootout with law enforcement.
Deputy Joshua LaFave was hit in the chest, back and shoulder during the gun battle. Deputy Jamie McLeod suffered bruising on her torso when a bullet lodged in her equipment belt.