Dateline has covered several cases of crime and betrayal. Yet some stories sent shockwaves like The Prussian Blue Mystery.

Cody Ernst died in June from thallium poisoning, a heavy metal once used to kill rodents. Prosecutors arrested and charged his roommate, Stuart Hanmer, with second-degree murder for his death.

ST. CLOUD, Minn. — A 35-year-old has been arrested for allegedly poisoning his roommate with a lethal amount of Thallium. According to the National Institute of Health, the element Thallium is ...

A Stearns County grand jury has indicted 35-year-old Stuart Hanmer for allegedly poisoning his roommate, Cody Ernst, with ...