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One, he had a legitimate reason to have cyanide. he's a brilliant university researcher, pharmaceutical industry uses it, it's used in industry. maybe he'll come up with the excuse he ordered a half pound of suicide two days before his wife's death. >> the amount matters. he can say, why would i buy so much on my own credit card? >> that's right. he put it on a university credit card. if he's this bright, would he be planning to kill his wife in such an obvious way? he may be able to say this is an accidental death in that i was mixing an energy supplement and somehow i mixed in the cyanide. t...

He died of natural causes, but did he? a suspicious relative asked authorities to take another look. >> being that it's an ongoing investigation with the the police and state attorney i'd rather not say which family member was involved, but they did relay significant concern to our doctor that this may have been something other than a natural death and then we acted on that. a cyanide screen came back positive at which point, our office then contacted the chicago p.d. and they really geared up their investigation. >> greta: the lottery winner's death now ruled a homicide. his blood full of cya...

The medical examiner concluded he died of natural causes, but did he? a suspicious relative asked authorities to take another look. >> being that it's an ongoing investigation with the the police and state attorney i'd rather not say which family member was involved, but they did relay significant concern to our doctor that this may have been something other than a natural death and then we acted on that. a cyanide screen came back positive at which point, our office then contacted the chicago p.d. and they really geared up their investigation. >> greta: the lottery winner's death now ruled a ...

His winnings was give some of it to charity and put the rest of it into his business. >> steve: dry cleaner. >> unbelievable. what's interesting is at the time the medical examiner did not do an autopsy because they have this basic regulation in the city of chicago where if you're 45 or older and you don't die of suspicious causes, they don't perform an autopsy. so they didn't do that on this guy. they did a toxicology test and the text psychology test later on found he died of cyanide poisoning. listen to the medical examiner. >> the cyanide screen came back positive, at which point our offic...