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Photo: The Canadian Press. All rights reserved.

FILE - This undated file photo provided by the Illinois Lottery shows Urooj Khan, of Chicago, posing with a winning lottery ticket. Khan died from cyanide poisoning in July 2012 shortly before collecting $425,000 in winnings. (AP Photo/Illinois Lottery, File)

The brother of a Chicago man poisoned with cyanide shortly after winning the lottery said Monday he is the family member who asked authorities to reconsider the initial finding that his sibling had died of natural causes.

Imtiaz Kahn said he had nightmares about his brother before his death and that his suspicions about the death lead him to push coroner's officials to conduct more test. Urooj Khan, 46, died July 20 as he was about to collect his $425,000 in Illinois State Lottery winnings.

Imtiaz Khan said Monday in a telephone interview that he began demanding more tests be conducted immediately after coroner's officials said his brother had died of natural causes.

Further tests revealed in November that Urooj Khan had been poisoned. His body was exhumed in January for more testing.

His body was exhumed in January for more testing.

Khan's widow, Shabana Ansari, and other relatives have denied any role in his death and expressed a desire to learn the truth.