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Police say the teen attacked and robbed four passengers on CTA buses and trains starting Jan. 8. The most recent attack was July 4.
Illinois State Police and the Chicago Police Department are investigating the Rev. Warren Beard's death. The Will County coroner's office will perform an autopsy Wednesday.
Sandra Kolalou, 38, was convicted in April of murdering 69-year-old Frances Walker. She faced a maximum sentence of more than 150 years in prison, Cook County prosecutors said.
More than 1,400 people have been arrested in connection with the breach in almost all 50 states. That includes Illinois, where at least 49 known residents have faced federal charges for their role.