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Chicago lottery winner died from cyanide poisoning

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Khan was pronounced dead July 20 at a hospital, but Cina would not say where Khan was when he fell ill, citing the ongoing investigation.

No signs of trauma were found on Khan's body during an external exam and no autopsy was done because, at the time, the Cook County Medical Examiner's Office didn't generally perform them on those 45 and older unless the death was suspicious, Cina said. The cutoff age has since been raised to age 50.

A basic toxicology screening for opiates, cocaine and carbon monoxide came back negative, and the death was ruled a result of the narrowing and hardening of coronary arteries.

Cyanide can get into the body by being inhaled, swallowed or injected. Deborah Blum, an expert on poisons who has written about the detectives who pioneered forensic toxicology, said the use of cyanide in killings has become rare in part because it is difficult to obtain and normally easy to detect, often leaving blue splotches on a victim's skin.

"The thing about it is that it's not one of those poisons that's tasteless," Blum said. "It has a really strong, bitter taste, so you would know you had swallowed something bad if you had swallowed cyanide. But if you had a high enough dose it wouldn't matter, because ... a good lethal does will take you out in less than five minutes."

Only a small amount of fine, white cyanide powder can be deadly, she said, as it disrupts the ability of cells to transport oxygen around the body, causing a convulsive, violent death.

"It essentially kills you in this explosion of cell death," she said. "You feel like you're suffocating."

A relative came forward days after the initial cause of death was released and asked authorities to look into the case further, Cina said. He refused to identify the relative.

"She [the morgue worker] then reopened the case and did more expansive toxicology, including all the major drugs of use, all the common prescription drugs and also included I believe strychnine and cyanide in there just in case something came up," Cina said. "And in fact cyanide came up in this case."

Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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