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MCKINNEY, Texas - Karmelo Anthony sobbed Tuesday as he was swiftly convicted of murder in the fatal stabbing of fellow high-school jock Austin Metcalf at a track meet - and his furious supporters raged,  This whole thing's been racist! 

The jury in Collin County deliberated about three hours before finding Anthony, 19, guilty of first-degree murder in the death of the 17-year-old and must now decide whether to put him away for life - prompting the killer's weeping mom to later take the witness stand and beg for mercy for her son, according to a report by NBC DFW.

 He's my oldest. He'll always be my baby. I love him very much,  Anthony's mom Kala Hayes sobbed to jurors before they headed into further deliberations to decide his sentence.

13 Karmelo Anthony, now 19, was convicted of fatally stabbing fellow high-school teen Austin Metcalf. Frisco Police Department 13 Metcalf was knifed over a dispute involving seating at a track and field meet April 2, 2025. x/AMetcal

As she spoke, Anthony also cried.

 I know my son, and he's very sorry for what he did,  Hayes told the jury.

 Please have mercy on my son. 

Anthony killed Metcalf during a April 2, 2025, run-in prompted by a dispute over seating at the track and field event in Frisco.

Anthony previously appeared glum, looking down and not immediately speaking with his lawyers, as he entered the courtroom to hear the verdict - then broke into sobs as it was announced, several outlets in court reported.

13 A person announcing the guilty verdict in front of a crowd of Anthony supporters at Collin County courthouse. AP Photo/Tony Gutierrez

13 People reacting to Anthony's guilty verdict. AP Photo/Tony Gutierrez

13 Law enforcement officers standing in front of the courthouse after the verdict was announced. AP Photo/Tony Gutierrez

Metcalf's twin, Hunter, sat next to his parents in court for the verdict.

Outside the courthouse, about 200 protesters for and against Anthony clashed.

 This whole thing's been racist. We didn't make it racist!  a protester screamed.

13 Supporters of Anthony d

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