‘It’s my mistake’: Woman takes plea deal over man’s death during robbery gone awry after QuikTrip cup filled with red liquid seals her fate

What was supposed to be a routine meetup in the early morning hours transformed into a nightmare, ultimately concluding in a Bexar County courtroom. It is an age-old story of a setup gone wrong, but in this digital era, the breadcrumbs left behind by the perpetrators are often undeniable. For 20-year-old Julie Marie Lopez, the illusions of escaping accountability shattered under the weight of meticulous detective work, digital footprints, and a seemingly mundane gas station drink.

In a courtroom visual that transfixed observers, Lopez accepted a plea deal that reduced her initial murder charge to aggravated robbery, yielding a 15-year prison sentence. “It’s my mistake,” she acknowledged in a moment of stark vulnerability, realizing that her choices had permanently erased a young man’s future and derailed her own. Yet, for the family of the victim, 20-year-old Isaiah Guevara, the courtroom development offered little solace and generated immense frustration.

A Scheduled Encounter and a Crucial Pit Stop

The tragedy unfolded in San Antonio, Texas, during the pre-dawn hours of October 26, 2024. Isaiah Guevara, a young man with his entire life ahead of him, was at his residence at the Villas of Oak Creste apartments on Fredericksburg Road. According to investigators, digital communication played a primary role in arranging the events of that fateful night. Instagram direct messages recovered by the San Antonio Police Department revealed an active dialogue between Guevara and Lopez. They were coordinating a meetup.

Initially, Lopez—who was 19 at the time—transmitted her home address to Guevara, intending for him to pick her up via a rideshare service. However, the plans shifted when Lopez messaged back stating she had secured an alternative ride.

Before arriving at Guevara’s apartment complex, the group made a casual stop at a nearby QuikTrip convenience store. This brief interlude, caught clearly on the store’s high-definition surveillance cameras, would later serve as the foundational anchor for the state’s prosecution. The security footage captured Lopez alongside Guevara inside the brightly lit store. In her hand, she held a recognizable QuikTrip plastic cup, capped with a distinct black lid, holding a bright red liquid drank through a straw. To the casual observer, it was just a teenager buying a late-night beverage. To homicide detectives, it was a piece of physical evidence waiting to be found.

The Ambush at the Villas of Oak Creste

A designated driver transported the pair from the convenience store back to Guevara’s apartment complex. What Guevara believed to be a private social visit was instead the staging ground for a coordinated ambush. As the young man welcomed Lopez into his home, external actors moved into position. The objective was robbery, but when dealing with illegal firearms and panicked individuals, the margin for error is dangerously thin.

Around 4:00 a.m., neighbors at the apartment complex were jolted awake by the unmistakable crackle of gunfire echoing through the breezeways. Panicked calls flooded the local emergency dispatch line, with residents reporting bullet holes tearing straight through their shared apartment walls.

When responding officers arrived at the scene, they discovered a chaotic and tragic environment. Inside the apartment, Isaiah Guevara lay unresponsive, having suffered multiple close-range gunshot wounds. He was pronounced dead at the scene, surrounded by spent shell casings that told a violent tale of rapid gunfire.

Yet, amid the forensic chaos of blood and ballistics, one specific detail on Guevara’s bedroom dresser immediately drew the attention of the processing technicians. Resting prominently on the surface was a cold QuikTrip cup, topped with a black lid and a straw, filled with a vibrant red liquid. Condensation was still actively bead-forming on the plastic exterior, proving beyond a doubt that the beverage had been placed there mere minutes before the shooting took place.

The Trail of Evidence and the Voice Memo

As the physical scene was processed, witnesses began providing crucial puzzle pieces. One neighbor informed detectives that they heard a woman’s frantic voice shouting from the parking lot toward the building immediately following the gunshots. Though the witness could not visually identify the woman in the darkness, they observed two unidentified men sprinting down the apartment stairwell. A nearby residential doorbell camera corroborated this timeline, capturing video footage of three individuals fleeing the complex in tandem.

The digital forensics phase yielded even more damming revelations. Beyond the Instagram logs establishing the timeline of the meeting, detectives unearthed an audio message sent by Lopez at 3:42 a.m.—minutes before the emergency calls were placed. In the urgent voice note sent to an associate, Lopez distinctly whispered that the group was currently “hiding”.

Ballistics analysis further tied the incident to organized criminal activity, as the shell casings retrieved from Guevara’s bedroom matched ammunition signatures linked to an entirely separate local crime scene. By late December, the driver of the vehicle provided a formal statement to the police, confirming they had dropped Lopez and Guevara off at the complex together. The visual match between the store’s surveillance footage of the red drink and the fresh cup resting next to the victim’s body effectively sealed Lopez’s legal fate. She was formally arrested in January 2025.

A Contentious Resolution in the Courtroom

For over a year, Lopez remained behind bars awaiting her day in court, accumulating 499 days of credit for time served. As prosecutors weighed the complexities of a felony murder trial—where proving who pulled the trigger can sometimes complicate a conviction—the Bexar County District Attorney’s Office extended a plea negotiation. In exchange for pleading guilty to a count of aggravated robbery, the state agreed to officially waive the top charge of murder.

The decision to settle for a 15-year sentence sparked absolute outrage from the family members of Isaiah Guevara, who packed the courtroom benches hoping for a lifetime sentence. Outside the courtroom doors, the atmosphere was thick with grief and bitter disappointment.

Denise Villarreal, Guevara’s grieving mother, alongside Christina Rodriguez, his aunt, openly condemned the plea structure. They expressed that reducing a case centered on the loss of life down to a property and assault charge felt like an systemic betrayal. “Them changing it from, truly, a murder charge to a robbery charge is upsetting,” Rodriguez stated, her voice trembling with emotion. “And that’s why we keep fighting. We’re going to keep coming for the hearings because it’s just not fair.”

The family also took aim at Lopez’s courtroom demeanor and assertions, flatly calling her a liar who attempted to alter her narrative on the stand to secure a lighter fate. “She’s a lying little girl,” Villarreal noted bluntly, refusing to accept the defendant’s tearful declaration of regret.

Ultimately, the judge accepted the terms of the plea deal. While Lopez will serve her designated time, the permanence of the tragedy remains unfixable. A young man lost his life over whatever valuables were kept inside a Northwest Side apartment, and a young woman traded her youth for a 15-year prison cell, all documented by a gas station drink that left a permanent record.