Silent and deadly, poison has long been a weapon of choice for killers hoping to pass off a victim’s untimely passing as an unexplained medical illness. From arsenic and cyanide to strychnine, lead and deadly nightshade, these so-called silent assassins have left a chilling mark on murder history. On this episode of Koltergeist, we explore four unique cases involving different poisons and examine how advances in science have helped expose killers who thought their secrets would remain buried.
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