Karmelo Anthony/YouTube screenshot Karmelo Anthony, a teenager from Frisco, Texas, was convicted of murder after stabbing and killing a fellow athlete, Austin Metcalf, during a high school track meet in April 2025. The teen maintained that he had no intentions to kill the fellow athlete, but was defending himself. Texas is a "stand your ground state," provided that one did not provoke an attack, and is not engaged in criminal activity. Both Karmelo and Austin were 17 years ol