Prosecutor tells jury that the killing of a teen at a Texas track meet was murder and not self-defense

A 17-year-old was fatally stabbed at a Texas high school track meet in Frisco; the accused teen is now on trial.
The defense says it was self‑defense, while prosecutors call it a “senseless murder”; the jury was seated under tight courtroom rules.
The case drew wide attention on social media and raised racial tensions, and authorities have warned against misinformation online.