"It's pretty unusual, " Cook County Medical Examiner Stephen Cina said, commenting on the rarity of cyanide poisonings.
BBC: Cyanide 'killed Chicago lottery winner' Urooj Khan
"In terms of intentional poisonings, you don't have a lot of that with cyanide, " Geller said.
CNN: Lottery winner exhumed; cyanide deaths rare, experts say
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