Galesburg woman Destiny Dixon, 23 and a mother of two, had stopped to help after a crash on Interstate 55 near the Will County-Grundy County line and Braceville.
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She was hit and killed by another vehicle that drove through the crash scene about 7:30 p.m. on northbound I-55.
Several people were hospitalized with life-threatening injuries after the incident, police said.
SEE ALSO: Woman killed in hit-and-run crash after rollover on I-55: officials
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State police said the vehicle that took off was a dark gray 2010 or 2011 Mitsubishi Endeavor.
It would have damage to the front driver's side.
Anyone with information is asked to contact Sgt. Cary Morin at 779-243-4770, or Grundy County Crime Stoppers at 815-942-6645.
A $1,000 reward is being offered for information that leads to an arrest.