Karmelo Anthony posed with guns and went on racist, violent rants over text messages before he fatally stabbed Austin Metcalf, according to a trove of new documents.

The 75-page dossier, obtained by the Daily Mail, offers insight into Anthony’s disturbing past — and was never revealed to jurors during his murder trial as part of a “gentleman’s agreement” between prosecutors and his defense team.

Photos show Anthony flashing a handgun in a screenshot of a video he recorded in November 2024, just five months before he killed Metcalf in a tent at a high school track meet in Frisco, Texas.

Another image from May 2024 shows the then-16-year-old…

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