The shooting happened during an apparent stickup that officials believe might be related to another nearby robbery, according to law enforcement sources, who said Preston’s gun was taken.
ShotSpotter, the city’s gunshot-detection system, registered nine fired rounds in the area, according to police radio traffic around the time of the incident.
An Apple Watch called 911 and indicated there was a traffic crash in the block about 2 a.m., according to the conversations over police radio. A responding officer who arrived about 15 minutes later — but more than 30 minutes after the shooting — reported Preston had been shot.
“We got a person shot,” the officer said over the radio. “It’s an off-duty [police officer]. Get an ambulance here now.”
The officer put Preston in a police vehicle and rushed her to the University of Chicago Medical Center, where she was pronounced dead, according to the police.
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