A prosecutor says a Texas teen accused of fatally stabbing another student during an altercation at a high school track meet in suburban Dallas has been indicted on a murder charge.

Karmelo Anthony, the now 18-year-old accused of fatally stabbing another teen during an altercation at a Frisco ISD track meet in early April, was indicted for murder by a Collin County grand jury on Tuesday.

The accused teen was 17 when he allegedly stabbed Austin Metcalf in the chest during a high school track meet. He reportedly confessed to the killing upon arrest, but claimed, "I was protecting myself.