Newly released security camera footage and photos show Karmelo Anthony shockingly confessing to fatally stabbing Austin Metcalf.

Anthony, 19, was sentenced last week to serve 35 years behind bars for killing Metcalf, 17, at a high school track meet in Texas last year.

A judge released new, enhanced footage of the incident at that event to the public Friday evening, beginning just seconds before the stabbing.

Back and forth movement is very briefly seen under the tent held by Memorial High School athletes at the meet, then Anthony runs away.

In another clip, Anthony is seen being apprehended by a local police officer who speaks into his radio that he's 'got the alleged suspect.'

'I'm not alleged, I did it,' replies Anthony as he's wrangled under control by law enforcement.

The public has also been shown the knife involved in the stabbing.  

The murder case shocked America, and the discussion surrounding the killing of a white teenager by a black peer quickly became racially fraught. 

During the trial, Anthony and his legal team claimed he stabbed Metcalf in an act of self-defense after they got into a confrontation during a rain delay at the sporting event on April 2, 2025.

Metcalf called out Anthony for standing under a tent that did not belong to his school, the Frisco Police Department said.

But prosecutors eviscerated Anthony's self-defense claim that Metcalf attacked him first with video evidence and witness testimony.

Witnesses who were in the tent described Anthony as the aggressor, testifying that Anthony told Metcalf, 'Touch me and see what happens,' provoking Metcalf to push Anthony, who then pulled out a knife and stabbed him in the chest.

Prosecutors said Metcalf's twin brother, Hunter, rushed to his aid as Anthony ran from the scene and later tried to blend into groups of kids who were exiting the stadium.

Anthony sat motionless in court as police body camera footage from the track meet showed Hunter pleading for help after the stabbing.

Jurors then gasped in horror after being shown never-before-seen photos of Metcalf's punctured heart during the trial.

Metcalf was stabbed once, with the knife piercing through his bone in the center of his chest and puncturing the right side of his heart, a medical examiner testified.

Still, while cross-examining the medical examiner, Anthony's lawyers implied that Metcalf impaled himself on the knife. 

He had originally faced between five to 99 years in prison for the murder, but prosecutors agreed to allow the jury to consider 'sudden passion' as a factor when determining his sentence.

'Sudden passion' is a legal term in Texas that allows a criminal to argue they were in an intense emotional state when they committed wrongdoing. It would have reduced Anthony's sentence to that of a second-degree felony for which he could have served as little as two years behind bars.

However, the jury rejected the argument and spent less than three hours passing its guilty verdict, and another roughly two and a half hours before they handed down their sentence.

Anthony will now have to serve at least half of the sentence before he is eligible for parole.

But the teenage killer filed a notice of appeal less than 24 hours after he learned his fate for fatally stabbing Metcalf in the heart.

'We believe there are several important issues for the appellate courts to consider. An appeal is the next part of the legal process and a right afforded every American,' his lawyer, Mike Howard, previously told TMZ.