Anthony Hill, 27, was shot and killed Monday afternoon by a DeKalb County police officer. According to police, Hill was naked, knocking on doors in the complex and crawling on the ground.

Hill then allegedly ran at the officer, ignoring commands to stop, police said. Hill was shot by the officer, identified Tuesday as Robert Olsen, and died at the scene. The GBI is investigating, and questions about what prompted the shooting remained unanswered.

Was Hill mentally ill? Was the use of force necessary against the unarmed Hill?

Hill, originally from Moncks Corner, S.C., was a 2006 graduate of Berkeley High School, where he was an athlete, The Berkeley Independent reported. He later served in the Air Force and attended the University of South Carolina, the newspaper reported.

At the regularly scheduled DeKalb County Commission meeting Tuesday morning, a handful of protesters stood up and chanted, "Indict. Convict. Send that killer cop to jail. The whole damn system is guilty as hell." The group marched out of the meeting during the chants.

Hill's own Facebook posts show a man voicing his concerns over recent police-involved shootings and positive living before an eerie final post.

"Where i once saw death i only see life," Hill posted at 8:40 a.m. Monday.

At 11:52 a.m., Hill Tweeted his final post.

Two hours later, he was dead.

News of Hill's death spread quickly on his own Facebook page  and his name became a hashtag on Twitter as the nation joined in the conversation.