Eric O'Neal, 18, Devon Walker,18, and 20-year-old Alfred Spikes are each charged with four counts of first-degree murder and one count of aggravated battery with a firearm.
The victims were gunned down Wednesday night during an attempted robbery in The Connect store, located in the 500-block of East 130th Street, investigators say.
According to information presented Saturday in court, Spikes walked into the store with an AK-47. He allegedly killed the security guard, took his gun and continued shooting. An employee returned fire.
One of the victims, 46-year-old Ihab Arafeh, was killed making a late-night delivery to the store when the shooting happened. The other victims include Michael Banks, 30, and store employee Weam Salem, 25.
Alex Spikes, 17, was also killed. It is believed he may have been related to one of the suspects.
Another teen suspect was injured, as well as a woman who remained hospitalized Saturday.
After court on Saturday, ABC7 spoke to O'Neal's lawyer and the brother of victim Weam Salem.
"It's hard, he didn't deserve this. I just hope justice is served. And I hope they all pay for it," said Aiman Salem, victim's brother.
"We are certain our client is innocent. He was just in the wrong place at the wrong time. He also got shot during the incident," said Davor Sicl, Eric O'Neal's lawyer.
A video camera inside the store reportedly caught the shootout on tape.