In opening arguments on Thursday in Karmelo Anthony’s murder trial, prosecutors said the baby face teen used a folding knife to stab Austin Metcalf at the time of their dispute.

Metcalf lifted up his shirt once he realized he had been knifed and exclaimed ‘I’ve been stabbed,’ before tumbling down several rows of bleachers.

Prosecutors said his brother Hunter rushed to his aid as Anthony ran from the scene and later tried to blend into groups of kids who were fleeing the stadium.

‘If you’re scared and running away in self defense, why toss the knife,’ the prosecutor said.

‘That knife wasn’t used to protect him from harm. That knife was used to harm another. Find this man guilty of first degree murder,’ he continued, pointing at Anthony.

Mark Porter, a forensic video analyst for the Tarrant County (Fort Worth) District Attorney’s office, is the first witness to take the stand in the trial.

In opening arguments on Thursday, prosecutors said that Karmelo Anthony used a folding knife to stab Austin Metcalf and then tossed it before fleeing the scene.

As Metcalf’s brother rushed to his aid, Anthony ran from the scene and later tried to blend into groups of kids who were fleeing the stadium, according to Collin County First Assistant District Attorney Bill Wirskye.

‘If you’re scared and running away in self-defense, why toss the knife,’ the prosecutor said.

‘What’s important to know is Melo is 5’8″ and 140 pounds. Hunter and Austin Metcalf are 6’1′ about 80 pounds heavier than Melo,’ defense attorney Mike Howard said, referring to Anthony by his nickname.

‘What you will hear is that Melo remained seated, even when Austin and Hunter stood up,’ Howard continued.

‘It is uncontroverted that Austin makes the first physical contact. Austin grabs, punches, pushes. In that split second, Melo has a decision to make, how and when to act.’

Karmelo Anthony’s defense attorney, Mike Howard, explained that he took the bus to the track meet the day he stabbed Austin Metcalf.

His lawyer claimed Anthony was scheduled to compete in several events at the event.

Anthony allegedly took cover under Metcalf’s team’s tent when it was raining because his school did not have one.

According to Howard, about 20-30 kids were under the tent, and all of them went to Metcalf’s school except for Anthony.

Karmelo Anthony’s defense attorney Mike Howard said his client was an A student who had two jobs, a girlfriend, and played sports at school.

He painted a picture of a supportive family as he explained Anthony’s mother was a nurse who stopped working as she had more kids and his father is a finance manager for a car dealership.

The family moved to Dallas area from Louisiana during Anthony’s freshman year where he joined the football team at school.

Karmelo Anthony’s defense attorney, Mike Howard, kicked off his opening statements by addressing misinformation surrounding the case.

‘There’s been a lot of noise about this case. A lot of completely false information,’ Howard said.

He addressed his client by his family’s nickname, ‘Melo.’

Prosecutors told the jury that Austin Metcalf texted his coach the morning he was killed and asked to ‘be a leader’ at the track meet where he was fatally stabbed.

Metcalf wanted to help run the track meet since their school was hosting other schools, and the coach needed help running the event.

The prosecution said the jury will see surveillance video of the stabbing and hear from witnesses during the two-week-long trial.

‘This killing, this murder is just senseless,’ the prosecutor said during opening statements.

Prosecutors began their opening statements in the murder trial of Karmelo Anthony, insisting the race is not relevant to the case.

‘This case has nothing to do with race,’ Collin County First Assistant District Attorney Bill Wirskye said.

Anthony had his knife ready to stab Austin Metcalf in a ‘surprise attack,’ the prosecutor claimed.

‘That’s why we are here, no other reason,’ Wirskye said. ‘This killing, this murder is just senseless.’

The twelve jurors sat at the Collin County Courthouse are mostly white, with the exception of three Asian people, one Hispanic man and one woman in a Hijab.

Earlier this week during jury selection, defense attorneys raised a Batson challenge: a legal objection used when it is believed potential jurors were struck off because of race.

The challenge and jury selection may come into question for possible appeals later in the trial.

Karmelo Anthony has arrived in court for the first day of his murder trial in the stabbing death of Austin Metcalf.

He wore a gray suit with a purple shirt and appeared clean-shaven with a short haircut.