During a track meet between Memorial High School and Centennial High School in Frisco, Texas, light rain begins to fall, and athletes take cover under tents with their respective teams at Kuykendall Stadium.

Memorial High School athlete Austin Metcalf finds Centennial High School athlete Karmelo Anthony under the Memorial High School tent and tells him he needs to move from under his team's tent.

When Anthony refuses, words are exchanged, and Anthony tells Metcalf, "Touch me and see what happens."

Centennial High School's Karmelo Anthony allegedly reaches inside his bag, grabs a knife, stabs Austin Metcalf in the chest, and runs away. As Metcalf's twin brother, Hunter, comes to his brother's aid, witnesses point out Anthony to a nearby middle school resource officer, who chases the suspect down.

The school resource officer confronts Karmelo Anthony, telling him to put his hands up in the air. Anthony tells the officer, "I was protecting myself," claiming Metcalf "put his hands on" him. Anthony hears the officer say he has the "alleged stabbing suspect" in custody, and Anthony replies, "I'm not alleged. I did it." Anthony claims self-defense. Now a jury has found Anthony guilty and he has been sentenced to 35 years.  Father Jeff Metcalfe joins Nancy Grace.