Armani Floyd was shot and killed on Friday night near Dearborn and Monroe.
New surveillance video from police shows the suspect clearly holding a gun and aiming it at someone. The suspect is seen wearing a purple outfit with a gray hooded sweatshirt.
Police also shared pictures showing the suspect's face moments before shots were fired.
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Thousands of people were downtown at the time of the shooting after the Millennium Park Christmas Tree lighting ceremony.
Floyd's death was tied to a so-called 'teen takeover.'
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Police say there were two separate shootings that night. The one that killed Floyd near Dearborn and Monroe.
And another right outside the Chicago Theater which left another seven teens injured.
Floyd was killed a couple of weeks before his 15th birthday.
"He didn't deserve it, and like all this could be prevented, everybody just come together as one, and stop trying to take people's lives," friend Kristian Thompson said.
His family is remembering him as a kind person and a good student.
2ndWard Alderman Brian Hopkins said in response to "teen takeovers" the city should instate a curfew well in advance of a planned gathering. Hopkins believes he has the votes to pass this curfew a second time, but it remains to be seen if Mayor Brandon Johnson would veto it again
Those who knew Armani Floyd well continue to cope with his sudden loss.
"I can't imagine what his family is feeling if I'm feeling this way," McKinley Nelson, founder of Project sWISH said.
Nelson is the founder of Project sWISH a nonprofit rooted in basketball and community, created as a safe space for Chicago's teens to escape gun violence.
"I'm also hurting in a way where I provided this program in a way so stuff like this doesn't happen," Nelson said. "For it to still happen, it makes me question how hard we're really going, right? If anything it'll put some fuel to the fire."
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Floyd attended the organization's weekly open gyms consistently for the past couple years and Nelson said he always brought his competitive spirit to the court.
Nelson said his last conversation with Floyd was just days before he was killed.
"I'm not there every single Wednesday, but Armani was there every single Wednesday," Nelson said. "One of the brightest smiles I've seen, super vibrant energy. Once he gets on the court, he would make it a thing to make sure he doesn't get off, right?."
Nelson said he tells kids in the program to always avoid these gatherings.
"Just don't go," Nelson said. " I don't understand it, right? I don't see anything positive coming from it. I don't understand the purpose of it."
Nelson is now working to commemorate and honor Floyd's life through Project sWISH in early December where he hopes his peers have a chance to heal, following this deep loss.
A reward of up to $15,000 is being offered for information leading to an arrest in this case.