Investigators say the victim followed another vehicle before both drivers pulled onto the highway shoulder, exited their cars, and began fighting. DeKalb County Police shut down the outer wall of I-285 near the Buford Highway exit while detective teams combed the scene for evidence. DeKalb County police are investigating a deadly late-night road rage shooting that left a man dead along the shoulder of Interstate 285 near Spaghetti Junction. I-285 fatal shootingWhat we know:According to DeKalb County police detectives, the violent incident began late Thursday night when a road rage dispute broke out between two drivers traveling along I-285. Anyone with information can send an anonymous tip to DeKalb County Police.