Insets, left to right: David Perez Morales Jr. and Jamari McKillion (Bexar County Sheriff”s Office). Background: The Amazon fulfillment center where Morales shot a man to death and McKillion served as the getaway driver (Google Maps).

The Bexar County Sheriff’s Office responded to an incident around 10 p.m. Sunday at the 10300 block of U.S. Highway 90 West in San Antonio. Upon arrival, deputies discovered two men with gunshot wounds. Both victims were transported to the hospital, but 26-year-old Katrael Delosier succumbed to his injuries. The second individual remains in stable condition.

According to a probable cause affidavit reported by local NBC affiliate WOAI and ABC affiliate KSAT, the conflict began earlier that day when the surviving victim and another employee engaged in a verbal dispute. Allegedly, the employee was upset over derogatory remarks and proposed a physical fight during their break time, to which the surviving victim agreed.

However, unknown to the surviving victim, the other employee had enlisted the help of two individuals — David Perez Morales Jr., 20, and Jamari McKillion, 20 — as reinforcement. As the break commenced, the employee and Delosier approached a Toyota Camry in the parking lot. At this point, Morales reportedly exited the vehicle and began shooting, according to police. Authorities claim McKillion acted as the getaway driver. The involvement and potential charges for the other employee remain uncertain at this time.

But what the surviving victim did not know was his rival brought along two men — David Perez Morales Jr., 20, and Jamari McKillion, 20 — as “back up.” When their break came, the employee and Delosier walked toward a Toyota Camry in the parking lot. That’s when Morales came out of the vehicle and opened fire, cops say. McKillion served as the getaway driver, authorities allege. It’s unclear if the other employee in question will face any charges.

Cops reportedly arrested McKillion at another Amazon facility and Morales at his home on Monday. Both face charges of first-degree murder and are in the Bexar County Jail on a $300,000 bond. Their next court date is set for April 13.

“[We are] heartbroken by the tragic loss of a valued member of our team and are keeping the victim’s family and loved ones in our thoughts,” Amazon said in a statement to KSAT.  It added that the company was cooperating with police and providing employees and the victim’s family with counseling.