Hieronyma Spara and Her Secret Society of Poi...

Belle Gunness wanted what every American wants: the American Dream. And through insurance fraud and murder, she eventually found it. "Hell's Belle," as she was known, used strychnine -- and a meat cleaver -- to kill an estimated 40 victims she met through personal ads, almost ...

Mary Ann Cotton was convicted of, and hanged for, the lethal poisoning of her stepson Charles Edward Cotton. But it's likely that she murdered as many as 21 people, including three of her four husbands and 11 children, apparently in order to collect on their insurance policies ...

Forty years ago, cyanide-laced Tylenol capsules led to the deaths of seven people all around the Chicago area. America was gripped by paranoia and fear. Why was this happening? Who would be next? Police grasped for suspects who might be the so-called “Mad Poisoner.” We’re joined ...  Show more

Listeners, we’re popping back into your feed this week to share a special crossover episode from Serial Killers and Conspiracy Theories. Forty years ago, cyanide-laced Tylenol capsules led to the deaths of seven people all around the Chicago area. America was gripped by paranoia ...  Show more

This is the finale of our Serial Killers and Conspiracy Theories crossover: By 2011, the FBI was ready to reexamine the evidence. A theory emerged: What if the Mad Poisoner was actually the Unabomber? Ted Kaczynski had proven he was a revenge-seeking terrorist, and he had connect ...  Show more

Around 2013 heroin users in the US and other countries suddenly started dying from overdose in previously-unseen numbers. The culprit turned out to be the incredibly potent drug fentanyl and it soon created a massive new wave in the opioid epidemic.See omnystudio.com/listener for ...  Show more