Sabrina Holloway said she is heartbroken and searching for answers.
"His friend said when they turned him over they saw smoke still coming from his body," said mother Sabrina Holloway.
Marcus Holloway, 18, was one of her eight children. Sitting in her living room on Sunday, Holloway told Channel 2 Action News reporter Erica Byfield about his last moments.
Holloway said she dropped him off at a DeKalb County apartment complex on Friday night at about 10:30 p.m.
"About two hours later they called me and said that he got shot up and had passed," said Holloway.
Holloway believes the shooting was a case of mistaken identity.
She said earlier in the evening one of her son's friends slashed another man's tires. When a car full of men pulled up later, she said everyone ran except Marcus. He was shot and killed.
"Marcus was innocent," said Holloway. "I cannot sleep, knowing (the killers) are out there walking around, doing whatever they want to do while my son is lying in a morgue with a toe tag on. And there is nothing I can do about it."
About 100 people attended a candlelight vigil for Holloway on Sunday night. "It wasn't even his beef. Someone just came shooting," a friend told Byfield at the vigil.
Holloway said money is tight for the family, so they're on a mission to raise as much money as they can to properly bury the teen.
"He took my son and he was only with me for 18 years. That is not near enough. I had just left my son and he was in good spirits. He was happy," said Holloway. "We know who did it. Turn yourself in. You took a wonderful man," Holloway said at the vigil.
DeKalb County police said officers continue to look for the shooter.