India, April 4 -- Austin Metcalf's alleged stabber made a chilling statement to the police, claiming that he fatally attacked the 17-year-old high school star in self-defence. Karmelo Anthony, also 17, boldly admitted at the time of his arrest that he was the one who killed the teenage football star, according to an arrest warrant obtained by NBC DFW.

The senseless killing took place on Wednesday during a high school track meet at Kuykendall Stadium in Frisco, Texas. "I'm not alleged, I did it," Anthony told cops while being arrested. The victim's father, Jeff Metcalf, told the outlet that his son died in his twin brother's arms after being stabbed in the heart.

An apparent verbal altercation between the Austin and Anthony led to his tr...