Police say a 17-year-old has been arrested on a murder warrant after fatally shooting a schoolmate on the campus of an Arlington, Texas, high school. The slain student was identified as 18-year-old Etavian Barnes by the Tarrant County Medical Examiner's Office. Barnes was found unresponsive with multiple gunshot wounds Wednesday afternoon outside portable buildings on the campus of Bowie High School, according to Arlington Police Chief Al Jones.