Earlier Wednesday, police released a photo of a suspect. They said the teen in the photo has the first name of "Luis" but also goes by "CK" and "Goonie."
He is described by police as Hispanic, in his late teens, 5'05 to 5'08", 120-140 pounds with brown hair. Police said he is known to frequent the area of Lockwood and Altgeld.
He's is wanted for shooting 17-year-old Emanuel Gallegos in the 4400-block of West Addison Street.
Gallegos, a popular Northside College Prep student, was with a friend on his way to get a haircut, according to his family.
Steve Jaimes, whose car was shot into, said the gunman didn't think twice about opening fire.
"They didn't hesitate to do that to us. They're not going to hesitate to do that to anyone else," Jaimes said.
Jaimes said Gallegos was kind and ambitious and his death has "scarred" him.
"I feel broken to know that this guy who was taller than me but still a kid died in my arms," Jaimes said. "He had a lot of goals, and they just got robbed from him. They just got robbed from him."
Anyone with information is asked to contact Area North Detectives at (312) 744-8261.