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.

Collin County District Attorney Greg Willis said Tuesday his team had presented evidence for several weeks before the grand jury returned the indictment.