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a late-model sedan just moments before the shooting
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and here's a shot of his driver who then sped off.
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Chicago P.D. I.D.'d the shooter
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as 16-year-old Gavin Rossler
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after getting a composite match
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from the National Center for Missing and Exploited Children.
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According to the database,
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Gavin's been missing for nearly 4 years.
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In looks like back in 2009
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when the mother filed the police report
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she insisted Gavin had been abducted.
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Mom was not the most credible source.