Karmelo Anthony, the teen who admitted to stabbing and killing a fellow high school athlete at a track meet in Texas, has been indicted on a first-degree murder charge.

Austin Metcalf, 17, bled out in his brother's arms after the then-17-year-old Anthony attacked him in the bleachers of David Kuykendall Stadium in Frisco in April 2.

Anthony, now 18, insisted he was acting in self-defense when he knifed Metcalf, however, he's never explained why he had a weapon at an event on school property.

However, Tuesday, he was formally charged by a grand jury in the crime that has drawn national attention over race and privilege.

'I fully believe that justice will be served for Austin Metcalf,' his father Jeff told DailyMail.com of the indictment.