While her husband and daughters were out of state, Dr. Teresa Sievers was murdered. 'This was almost the perfect crime,' says prosecutor Cynthia Ross. 'There was absolutely no trace evidence.'

We spoke with Joni Johnston, a forensic psychologist, to explore the ancient legacy of poisonings, the psychological profile of a homicidal poisoner and common myths and misconceptions about those who poison.

Parents might not report their missing child for a myriad of reasons: because they are the perpetrator in a crime against the child, immigration concerns and more.

Missing since May 2019, investigators fear that answers to their pressing mystery—what happened to Jennifer Dulos?—were lost with the death of their chief suspect, her estranged husband, Fotis Dulos.

On December 28, 1956, the Grimes sisters, 15 and 12, left home to watch heartthrob Elvis Presley in Love Me Tender in Chicago. Six decades later, their inexplicable murder remains unsolved.

On Halloween 1974, a Texas man poisoned his young son with cyanide-laced candy in an attempt to collect the insurance money. He became known as 'The Candy Man.'

For fans of the 23-year-old pop star, her murder was a shocking tragedy. But for those close to Selena, it was an event foreshadowed by multiple warning signs of her fan club president's nefarious intentions.

A popular theory claims three childhood behaviors—animal cruelty, fire setting and persistent bedwetting—can indicate a serial killer in the making.

It's been over 40 years since Jeffrey MacDonald was convicted of killing his wife and daughters. But he still claims he is innocent.

The serial killer seemed to be a well-adjusted adult. But his crimes included binding, torturing, raping and ultimately murdering 33 male victims, some as young as 15 years old.