MCKINNEY, Texas - A teenager who fatally stabbed a competitor at a Texas high school track meet was upset immediately after the confrontation and said he had warned the victim "not to touch me," a witness testified Monday as a trial entered a second week.

Karmelo Anthony, now 19, is charged with murder in the death of Austin Metcalf, 17, at a school stadium in Frisco, a Dallas suburb, in April 2025.

Prosecutors say the stabbing was an unprovoked attack related to a dispute over whether Anthony could be under the tent of Metcalf's team during a rainy track meet.