CHICAGO (CBS) — Exactly 15 years ago tonight, a 15-year-old boy was killed in the Lincoln Square area.

Now, for the first time since that killing, the father of David Dominguez is speaking out.

CBS 2’s Mike Puccinelli is the first to speak to him in this Original Report.

“His mom called him and said ‘David put your bike away.’ So he came over here…oh boy, this will be difficult,” Gil Dominguez said as he walked up to the spot where his 15-year-old son was shot dead.

David Dominguez’s killers shot him in the chest before speeding away in a car 15 years ago tonight. The Mather High School sophomore was able to run to toward his mom, despite being hit multiple times.

“When he reached the front, he collapsed on the front steps,” Gil said. His mom heard the shots but thought they were firecrackers and that her son was playing a joke until from the second floor window she saw blood trickling from David’s body and down the sidewalk.

“At that moment she went down the stairs and she came here and she cradled our son as he was dying as he was taking his last breath,” Gil said.

She would never spend another night in the home and is still too distraught to talk about David’s murder. But his father, Gil feels he has to in the hopes of bringing David’s killers to justice.

“I owe my son. I owe my family to find closure on this,” because 15 years later the pain is still acute and the emotions are still raw.

“It doesn’t get any easier,” Gil says.

“When I used to drive or walk, I would see kids who resemble my son and I would rush over to see their face. I was hoping that my son would be alive somehow, and somehow it was a bad dream that I needed to wake up from. But it wasn’t a dream. It was actually very real.”

If you have any information about what happened to David Dominguez on Sept. 7, 2001 please call the police or Crime Stoppers at (800) 535-7867.