Article Photos: Obama hails Ga. school worker who averted tragedy 1/6

Natasha Knotts speaks to a reporter in Lithonia, Ga. on Wednesday, Aug. 21, 2013. Knotts told The Associated Press that Michael Brandon Hill lived with her and her husband for a time when he was in his late teens. She says she served as a mother figure for Hill in after he started coming to the small church where she and her husband are pastors. Before going to the school, investigators say that Hill took a photo of himself with an AK 47-style rifle and packed up nearly 500 rounds of ammunition â enough to shoot more than half the school's students. (AP Photo/Johnny Clark)