Prosecutors, Chicago police and the Cook County Medical Examiner's Office are trying to unravel precisely how Urooj Khan, 46, was killed and have not publicly identified any suspects.Khan's death on July 20 was initially ruled a result of natural causes. But a relative's request for a deeper look resulted in the startling conclusion months later that Kahn was killed with the poison as he was about to collect $425,000 in winnings.
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