Karmelo Anthony told authorities he acted in self defense after allegedly fatally stabbing Austin Metcalf at a Texas track meet in April.

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.

A stabbing incident involving two students from different schools results in the suspect claiming self-defense.