Karmelo Anthony, 17, was arrested and charged with murder for fatally stabbing Frisco Memorial High School student Austin Metcalf during a track meet.

A fight between two students resulted in one stabbing the other at a Frisco ISD track meet. 17-year-old Austin Metcalf was stabbed in the heart and died in his twin brother’s arms, their father said.

Karmelo Anthony told responding officers he stabbed Austin Metcalf in self-defense, an arrest affidavit shows. Anthony's bond hearing is Monday.