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

Karmelo Anthony, now 18, who is accused of fatally stabbing fellow student Anthony Metcalf during a Texas high school track meet in April, was indicted on a first-degree murder charge in the teen’s death.

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