Murder of Jacob Ybarra and Sabion Kubitza by Zamar Kirven examined on Murder Under the Friday Night Lights

Mugshot of Zamar Kirven
Zamar Kirven was sentenced to spend the rest of his life in prison. Pic credit: McLennan County Sheriff’s Office

Murder Under the Friday Night Lights is investigating the murders of Jacob Ybarra and Sabion Kubitza, both of whom were shot dead by their so-called best friend Zamar Kirven in their hometown of Mart, Texas.

Kirven was a football linebacker and had been a teammate of Ybarra at the local Mart High School, and then went on to play two seasons at the University of Houston.

Unfortunately, things went wrong for the linebacker, and he was thrown out of Houston for violating team rules. He went back to Mart, where Ybarra’s family gave him a room in their home.

Kirven spent the next few weeks hanging out with his buddies, 20-year-old Ybarra and 22-year-old Kubitza, smoking marijuana, playing video games, and watching movies.

But on the night of April 18, 2021, Kirven got high on LSD and used a Glock 9 mm to kill his two friends. It was reportedly his first time using the hallucinogenic drug.

Ybarra’s father, Anthony Medlock, told the cops that Kirven came into his and his wife’s room with the gun. The killer told Ybarra’s parents that people were out to get him and then asked what someone looks like when they die.

Medlock then saw the bodies of Kubitza and his son. He managed to take the gun from Kirven, chased him out of the house, and took a shot at him but missed.

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Killer Zamar Kirvan fled scene after shooting Jacob Ybarra and Sabion Kubitza

Kirvan ran to his father’s house and told him he felt he was in a “nightmare” and that he thought he had just killed somebody.

At his trial, Kirvan’s legal team tried to argue that it was his cousin, Kevin Kirvan, who was the killer. However, Kirvan’s DNA was found on the gun. And his footprints appeared to match those left by the killer.

Kevin Kirvan had already had multiple run-ins with the law and was facing an unrelated murder charge.

Zamar Kirvan sentenced to life for Jacob Ybarra and Sabion Kubitza murders

In June 2023, Kirvan was found guilty of capital murder. The prosecution did not seek the death penalty, so he was given an automatic sentence of life in prison without the possibility of parole.

At the sentencing, Ybarra’s sister read a statement from their recently deceased mother, Maria Ybarra, reading, “I just got out of the hospital trying to get my life back together, and what you did set me back. I considered you family. We took you in, and you betrayed us.”

Kubitza’s mother released an impact statement through a representative that read, “You killed them for no reason and showed no remorse so you deserve everything you will get in your sentence. You may have been high, but you knew what you did because you posted about it on Snapchat.”

Murder Under the Friday Night Lights airs Wednesdays at 10/9c on Investigation Discovery.

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