A trial is underway in Collin County for Karmelo Anthony, a teenager from Frisco. Anthony is facing a first-degree murder charge related to a fatal stabbing at a high school track meet. The victim was 17-year-old Austin Metcalf.

The trial began on Thursday morning. On the first day of testimony, a prosecutor questioned Metcalf's track coach. Further details about the case and trial are available from NBC DFW.