One person has died and another has been shot in a parking lot across the street from Mt. Zion High School, police said. The two people shot were not students. There was a graduation ceremony happening across the street at the Clayton County Performing Arts Center, Channel 2 Action News said. The shooting happened after the graduation concluded, and an arguement led to the shooting, police told Channel 2. @JustinWilfonWSB Clayton County School Police say the shooting happened after a graduation ceremony here. Argument led to the shooting. Two women shot, one killed. Both people shot were adult women, Channel...