Teen Ashton Hornsby was killed at an after-prom party; Carlos Diaz has been arrested in connection with the shooting.

He was pronounced dead at the scene, police said. The department's major crimes unit then took over the investigation. Detectives later identified Bryon Canady, 64, of Powder Springs, as the suspect.

An after-prom party in Powder Springs ended in gunfire over the weekend. Now one Smyrna teen is dead and another is behind bars.