Authorities in Tennessee have arrested a 17-year-old suspect in the fatal shooting of high school senior Ladainian Cathey, who was shot just hours after his prom. The suspect was not named in the police statement but identified by friends and family. Police responded to a shooting around 1:40 a.m. on Sunday and transported Cathey to the hospital, where he was later pronounced dead. A barber had given Cathey a haircut the day before the shooting.