A 17-year-old student charged with murder in the fatal stabbing of another student at a track meet allegedly confessed to the killing and officers say he told them he was protecting himself, according to the arrest report.

The incident occurred Wednesday morning at a Frisco Independent School District stadium during a track and field championship involving multiple schools in the district.

Austin Metcalf, 17, an 11th grader at Frisco Memorial High School, died after police said another student stabbed him during an altercation in the bleachers at the meet.

The suspect in the deadly stabbing — Karmelo Anthony, a student at Frisco Centennial High School — has been charged with first-degree murder, police said.

One officer who responded to the scene said Anthony told him unprompted, without being asked any questions about the incident, “I was protecting myself,” according to the arrest report.