Gang Dispute Turns Deadly in Mesa as Two 19-Year-Olds Charged in Four-Victim Shooting

A Neighborhood Shaken by Gang Violence

Two 19-year-old Mesa men are accused of starting an alleged gang confrontation that escalated into gunfire, leaving four people wounded. What began as a tense street encounter on the evening of September 22 quickly spiraled into one of the more alarming gang-related incidents northwest Mesa has seen in recent memory — and it unfolded in plain sight of a residential neighborhood.

On September 22, Mesa police officers responded to a shooting around 6 p.m. near McKellips Road and Center Street, where they found three adults and one teen shot. A neighbor who witnessed the aftermath said she heard a barrage of gunfire before seeing victims in the street — she asked not to be identified by name or shown on camera for her safety, saying, "I don't know, but we heard a lot of gunshots," and when her family looked outside, people were lying in the street.

How the Confrontation Unfolded

According to court documents, Jonathan Valladares Mojica and Mark Cortez Garcia were in a Jeep circling a home south of McKellips Road and near Center Street when two people in a truck heading to a store noticed them. The Jeep cut off the truck and forced it to stop, at which point Mojica yelled at the pair to get out while shouting gang identifiers. An argument broke out, and investigators said Mojica pulled a handgun from his waistband and pointed it at the victims. Two more people came out of a house to see what was going on after they were told the original two were being threatened by Mojica with a gun.

Court documents state that Mojica and Garcia are suspected members of the South Side Locos gang. One of the victims was reportedly a member of a rival street gang. The encounter, then, was not random — it was a targeted act of gang intimidation that spun out of control and ultimately put innocent bystanders at risk in a quiet residential area.

Arrests, Charges, and Key Evidence

Detectives said Garcia later turned himself in, admitted he drove the Jeep, and identified Mojica as the shooter. All the victims also identified Mojica out of a lineup. Mojica was booked on four counts of aggravated assault with a deadly weapon, one count of assisting a criminal street gang, one count of threatening or intimidating to promote a criminal street gang, and one count of unlawful discharge of a firearm. His bond was set at $250,000.

Mark Cortez Garcia was arrested on suspicion of four counts of facilitation to commit aggravated assault, assisting a criminal street gang, and a gang-related threat offense. The fact that Garcia turned himself in and cooperated with investigators may factor into how his case proceeds, though both men now face serious felony charges that carry significant prison time under Arizona law.

Victims and What Comes Next

Police said all four victims were taken to the hospital, and two people have since been released. One adult and a teen are still in the hospital. The presence of a teenager among the victims underscores how gang violence rarely stays contained to those directly involved — it bleeds into communities, onto sidewalks, and through front doors. Mesa Police Detective Robert Katz said the case is being taken seriously, noting, "It's a very serious concern."

With two suspects now in custody and multiple witnesses having identified the alleged shooter, prosecutors appear to have a strong foundation for their case. But beyond the courtroom, this incident raises familiar and urgent questions about gang activity in the East Valley and what it takes to keep neighborhoods safe. For the families living near McKellips Road and Center Street, the sound of gunfire on a Tuesday evening is not something easily forgotten.