FRISCO, Texas — The suspect accused of fatally stabbing a 17-year-old Frisco high school student at a track meet Wednesday morning reportedly confessed to the incident, claiming he was protecting himself, according to the arrest affidavit.

One witness reportedly told police that the victim, Austin Metcalf, had told the suspect, Karmelo Anthony, he would need to move out from under his team’s tent, the affidavit stated. Anthony is a student at Centennial High School, but was reportedly sitting under Memorial High School’s tent.

Upon telling him this, the witness told police that Anthony opened his bag and reached inside. 

“Touch me and see what happens,” Anthony told Metcalf, according to a witness.

Metcalf reportedly then touched Anthony, the witness told a responding officer, and Anthony told Metcalf to punch him and see what would happen. 

Soon afterward, the witness said, Metcalf reportedly grabbed Anthony to tell him to move. At which point, the affidavit continues, Anthony reportedly pulled out what the witness recalled as a black knife and stabbed Metcalf once in the chest before running away.

Metcalf reportedly started grabbing his chest and telling people to get help, the witness told police.

Another witness interviewed by police told the same story of the altercation occurring inside Memorial High School’s tent, the affidavit shows.

In the affidavit, the arresting officer says that when he found 17-year-old Anthony, he reportedly told the officer, “I was protecting myself,” before the officer had even questioned him about the incident.

As the officer was walking Anthony off the track, the suspect reportedly further said that the Metcalf had “put his hands on [him].”

Anthony was then handcuffed, the affidavit reads. After another officer arrived, the arresting officer advised that he had the alleged suspect, to which Anthony reportedly said, “I’m not alleged, I did it.” 

“He put his hands on me, I told him not to,” Anthony reportedly told officers as they walked him to a police vehicle.

The officer also noted fresh blood on Anthony’s left middle finger while he was in the back seat of the vehicle, the report detailed.

Anthony also reportedly asked the officer if Metcalf was going to be OK while he was in the back seat of the vehicle, the document states.

According to the affidavit, the knife Anthony allegedly stabbed Metcalf with was later found in the bleachers at the track. Anthony had reportedly thrown it there following the stabbing.

The UIL track meet has been postponed to Monday and moved to Little Elm High School, with the district promising to share updated security precautions with families in the coming days.

WFAA spoke with Kari Ordas, the owner of Halo Pizzeria in Frisco, where Austin worked part-time alongside his mother, Meghan, and his identical twin brother, Hunter. To help ease the financial burden of funeral and legal expenses, Ordas has launched a GoFundMe for the Metcalf family and is planning a fundraiser at Halo Pizzeria in the near future.