Who is the alleged Georgia school shooter? What we know

This is a developing story.

Colt Gray, the alleged gunman who opened fire at Apalachee High School in Barrow County, Georgia, killed four people and injured at least nine Wednesday morning when he began shooting at innocent victims inside the school, police say.

At approximately 10:20 a.m., around two hours after classes at Apalachee had begun, the Barrow County Sheriff's Office responded to reports of an active shooter.

"Within minutes, law enforcement was on scene as well as...