Police found 19-year-old Sierra Evans on Saturday morning in the 9500-block of South Avenue N in the city's East Side neighborhood.
Her family said she had been at a nearby party the night before.
"Sierra was a good person. Nothing like this should have ever happened to her; she was so kind-hearted. Sierra never crossed nobody, never did nothing wrong to nobody. This was uncalled for," friend Timia Garrett said.
The evening vigil Wednesday was held at the spot where Evans was found.
A Chicago alderman is calling for ShotSpotter to be reactivated after Evans' death.
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Alderman David Moore, with the 17th Ward, said officers responded when a neighbor called 911 at 9 a.m. However, that was hours after the shooting actually happened.
"What saddens me is that a young lady had to, No. 1, die alone, but two, possibly could have gotten some help, some immediate help, and possibly could have survived," Moore said. "And possibly could have had enough evidence or captured the person that had done this so that we can bring justice."
ShotSpotter was deactivated on Sept. 23, days before Evans' death.
A local alderman said ShotSpotter detected the gunfire that killed Evans.
"We want justice for her; she deserves justice. Nobody should be just tossed in the alley like this and be treated like a piece of garbage. She is a human, like anybody else. We need justice for her; we need closure. And I feel if we had the ShotSpotter camera, we would have found her hours before," uncle Mark Abrams said.
Alderman Peter Chico, with the 10th Ward, said the police could have been alerted more quickly if ShotSpotter were still in use.
The city said it's looking for an alternative to the gunshot detection technology.
A $2,500 reward is being offered for information leading to an arrest and conviction in the case.
Chicago police continue to investigate.
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