The jury trial began on Monday, March 2, 2026, lasting five days. The State was represented by Assistant State’s Attorneys Brooke Wanzenberg, Daniel Lenzini, and Russel Caskey. Prosecutors called more than a dozen witnesses, including law enforcement officers, medical personnel, and expert witnesses. 

Vargas was first charged in February 2022, after Round Lake Beach Police and the Lake County Major Crimes Task Force (LCMCTF) responded to the 2000 block of Apache Tral in Round Lake Beach. When officers arrived, they found Brian Mahdee, 37, with several stab wounds on his body and was pronounced deceased at the scene.  

At the trial, law enforcement testified that when they first arrived at the scene, Vargas had non-life-threatening wounds to his arm. An eyewitness told jurors that Vargas inflicted the wounds on himself in an attempt to make it appear that he had acted in self-defense after being attacked by the victim.  

The witness also described how Vargas brutally attacked Mahdee while Mahdee was seated and using his phone. Witnesses further stated that after the attack, Vargas attempted to clean up the scene and asked others present not to call the police. 

Investigators testified that during the interrogation, Vargas gave several inconsistent statements and claimed to police that he was defending himself. Investigators explained how evidence showed that Vargas attempted to stage the scene to support that claim. Expert testimony further established that the DNA recovered from the weapon was inconsistent with Vargas’s self-defense claim. 

Medical personnel determined that Mahdee suffered more than 40 stab wounds throughout his body. 

After the State rested its case, the defense called two witnesses, including Vargas. During his testimony, Vargas again provided statements that were inconsistent with prior versions of events. 

Lake County State’s Attorney Eric Rinehart stated, “Immediately after this unprovoked attack, this offender began lying and attempting to hide his crime. His guilt was further revealed by his wildly inconsistent trial testimony. Despite these efforts, investigators and prosecutors showed the jury the truth of this heinous attack. We will support the victim’s family and loved ones while also making sure this offender can never hurt anyone again.” 

Before the trial, Vargas was being held in the Lake County Jail on a $3 million bond. (This cash bond was set by a judge in late 2022, before the effective date of bail reform which now prevents individuals charged with murder from posting bond if a judge so decides at the beginning of the case.)  After the guilty verdict, Judge Levitt revoked Vargas’ ability to post bond. 

Vargas is facing a potential “life” sentence in the Illinois Department of Corrections after the jury also found that the Murder was accompanied by “exceptionally brutal or heinous behavior indicative of wanton cruelty.” Vargas’s next court hearing is scheduled for April 28, 2026, for status.