An Indiana woman is facing murder charges after police say she shot and killed a young man in front of his girlfriend—all because he honked his horn.

The incident, which prosecutors are calling “a senseless act of rage,” took place in the middle of the afternoon on October 17 in west Indianapolis. According to the Marion County Prosecutor’s Office, 23-year-old Deborah Benefiel allegedly became enraged when 21-year-old Kentrell Settles honked at her at a green light. What followed, investigators say, was a short but deadly chain of events.

“The shooting occurred at approximately 2 p.m. and is alleged to have occurred after the victim honked at the defendant to alert them that a traffic signal had turned green,” the prosecutor’s office said in a statement. “It’s further alleged the defendant followed the victim while yelling and throwing her hands at them before shooting into his vehicle, striking him in the chest.”

Settles, a former high school basketball player and warehouse worker, was rushed to Eskenazi Health in critical condition but later died. According to the Indianapolis Star, the bullet tore through his lung and heart before lodging in his chest.

Witnesses told police the encounter began at an intersection, where Settles honked once after Benefiel failed to move when the light turned green. Instead of driving away, she allegedly began tailing Settles’ car, shouting and gesturing out the window as she followed him down the road. Moments later, she pulled up alongside his vehicle and fired a single round.

Settles’ girlfriend, who was sitting in the passenger seat, identified Benefiel as the shooter, according to local reports. Police found her a short time later at a nearby gas station, where she and her mother were allegedly trying to remove stickers from the car to make it less recognizable. Benefiel was arrested on the spot and later charged with murder and criminal recklessness. She is scheduled to appear in court on October 21.

Marion County Prosecutor Ryan Mears said the case reflects a disturbing pattern of violence on Indiana’s roadways. “Too often we see a moment of frustration escalate into tragedy,” Mears said. “A moment of anger should not cost someone their life. This was a senseless act of violence that destroyed two families in an instant.”

Friends and family members of Settles are still trying to make sense of the loss. His father, Kenneth Murff, told Fox 59 that his son was “loved by so many people” and “had his whole life ahead of him.” “A precious life was taken for no reason,” Murff said. “Over something as small as a honk. That’s not how it’s supposed to be.”