Newly released surveillance video shows Hill walking into the school after being let in the front door by a woman with a child.

Police said Hill confronted office staff around 1 p.m. and told bookkeeper Antoinette Tuff to call the local media. She told a WSB-TV that the gunman wanted the news to "start filming as police die."

Police said Hill opened fire at the school and was armed with hundreds of rounds of ammunition, but he was eventually apprehended peacefully.

No students, faculty or law enforcement officers were injured in the ordeal.

Hill was sentenced to 40 years in prison, with 20 to serve.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools