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 17-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 Monday. Anthony was arrested on April 2 in connection with the stabbing 17-year-old Austin Metcalf during a track meet at Kuykendall Stadium.

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.