UPDATE, 5:37 p.m.: OAKDALE -- The Stanislaus County Sheriff's Department gave few details this afternoon into the shooting in Oakdale Sunday night that left two people dead.
Sgt. Anthony Bejaran confirmed that the suspected shooter, Ryan Neil Mazzariello, was in the military. There was no specific branch of the military mentioned.
He also would not confirm whether the shooting was tied to any gang or drug action in the area, as a number people at the scene speculated on Monday afternoon.
Meanwhile, a reporter at the shooting scene on Monday witnessed a fight that broke out near makeshift memorials for the two victims. Police responded but did not make any arrests.
See video of the confrontation below.
Check back at modbee.com later when reporter Erin Tracy shares her interview with the sister of the 15-year-old victim.
Video of confrontation
Video of interview with victim's sister
Two people, including a 15-year-old boy, are dead after a shooting in the parking lot of the Oakdale Market on Sunday night, authorities said.
An Oakdale police officer was in the area of the market at 311 East I St. at 9:05 p.m. when the officer heard a sound of gunfire, according to Sgt. Anthony Bejaran of the Stanislaus County Sheriff's Department.
The officer found numerous people in the parking lot, including the two victims on the ground.
Emergency crews took Abel Calderon, 20, of Oakdale, to a nearby hospital, where he later died from his injuries. Ruben Mora Jr., 15, was pronounced dead at the scene, Bejaran said.
After talking to witnesses, officers determined that Ryan Neil Mazzariello, 25, of Oakdale, was the suspect. They went to his home and after a brief discussion with Mazzariello, who surrendered to officers without incident and was taken into custody.
He is being held in Stanislaus County Jail. No bail has been set.
Bejaran said there were a number of witnesses who cooperated with homicide detectives, and some who did not.
He said detectives are not releasing details about what led to the shooting until more interviews with witnesses could take place.
An employee inside the store who worked on Sunday night said Monday morning he didn't hear anything or notice any signs of an altercation or dispute.
The employee would not give The Bee his name, only referring to himself as "Boss."
"All of a sudden, boom, boom. Just like that," the store worker said. "We don't know exactly what made it happen.
"It's my best friend who got killed. He almost died in my hands."
The sheriff's department is assisting with the investigation at the request of the Oakdale Police Department.
Anyone with information about this investigation can call Detective Frank Soria at 209-525-7080.
We'll have more on this story as information becomes available.
Bee senior editor Brian Clark and Bee columnist Jeff Jardine contributed to this report.