Jury Convicts Man in 2022 Stabbing Death of Grayslake Man

Prosecutors said the unprovoked attack left the victim with more than 40 stab wounds.

Published on Mar. 9, 2026

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A jury has convicted a 33-year-old Round Lake Beach man of first-degree murder in the 2022 stabbing death of a 37-year-old Grayslake man. Prosecutors said the victim suffered more than 40 stab wounds in the unprovoked attack, and the defendant attempted to clean the scene and claim self-defense, but evidence showed his account was inconsistent.

Why it matters

This case highlights the ongoing issue of violent crime in the region and the challenges law enforcement and prosecutors face in holding perpetrators accountable, especially when they attempt to cover up their actions.

The details

During the five-day trial, prosecutors called more than a dozen witnesses, including law enforcement, medical personnel, and expert witnesses. They presented evidence that the defendant, Jesus Vargas, attacked the victim, Brian Mahdee, while he was seated and using his phone. Vargas then attempted to clean the scene and asked others not to call the police, claiming self-defense. However, an eyewitness testified that Vargas inflicted non-life-threatening wounds on himself to make it appear he had acted in self-defense. Investigators also found DNA evidence on the weapon that was inconsistent with Vargas's account.

  • The incident occurred in February 2022.
  • Vargas was originally charged in February 2022.
  • The five-day trial began on March 2, 2026.
  • The jury delivered its verdict on March 9, 2026.

The players

Jesus Vargas

A 33-year-old Round Lake Beach man who was convicted of first-degree murder in the 2022 stabbing death of Brian Mahdee.

Brian Mahdee

A 37-year-old Grayslake man who was the victim of the 2022 stabbing attack that left him with more than 40 stab wounds.

Eric Rinehart

The Lake County State's Attorney who said the defendant's efforts to lie and hide his crime were ultimately unsuccessful.

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What they’re saying

“Immediately after this unprovoked attack, this offender began lying and attempting to hide his crime.”

— Eric Rinehart, Lake County State's Attorney (Patch)

What’s next

Vargas will be sentenced at a later date, and the judge will determine the appropriate punishment for the first-degree murder conviction.

The takeaway

This case underscores the importance of thorough investigations and the presentation of strong evidence to hold violent offenders accountable, even when they attempt to cover up their crimes. It also highlights the ongoing need for community-based solutions to address the root causes of violence in the region.