In the late 1980s, Canada was on edge. A violent predator known as the Scarborough Rapist was stalking women, leaving fear in his wake — and no one knew who he was.

In Part One of Ken and Barbie Killers: The Evil Duo, we trace the origins of one of Canada’s most disturbing true crime cases. We begin with the attacks that terrified Scarborough, then follow the fateful meeting of Paul Bernardo and Karla Homolka — two people whose psychological needs and darkest impulses aligned in the most dangerous way possible.

As their relationship deepens, so does the violence. We explore their backgrounds, how they hid in plain sight, and how their need for control and validation spiraled into something unthinkable. The episode builds toward the devastating betrayal at the heart of this case — the death of Karla’s younger sister, Tammy — and the chilling reality that the crimes did not stop there.

This episode examines how evil can grow quietly, how love can become a weapon, and how the most dangerous monsters are sometimes the ones who look the most normal.

Part Two will pick up with the investigation, arrests, trials, and the psychological reckoning that followed.

⚠️ Listener discretion advised.

In this episode of Straight to the Case, we unravel one of the strangest and most unsettling poisoning cases in modern true crime — the death of David Castor.

What was first ruled a suicide quickly unraveled into something far more sinister. Antifreeze. A staged scene. A so-called confession letter that raised more questions than answers. As investigators dug deeper, they uncovered a chilling pattern of manipulation, control, and calculated deception that turned a quiet family home into the center of a deadly mystery.

We walk through the timeline of David’s final days, the forensic red flags that couldn’t be ignored, and the shocking truth that ultimately came to light — a truth that would expose a plot years in the making and force everyone involved to ask: how far can someone go to get away with murder?

This is Poisoned: David Castor — a case where nothing is accidental, and the truth was hidden in plain sight.

Just after the holidays, a family of four vanished without a trace.

Their home looked lived in. Their dogs were left behind. Their phones, wallets, and passports never moved.

At first, investigators believed the McStay family had chosen to leave—possibly crossing the border to start a new life. Media speculation followed, searches slowed, and the case quietly drifted into the background.

But years later, the truth would surface in the most devastating way.

In this episode of Straight to the Case, we examine the disappearance of Joseph, Summer, Gianni, and Joseph Jr. McStay—how assumptions shaped the investigation, how the story the public accepted delayed answers, and how the case was ultimately brought to trial.

This is a story about silence, trust, and what happens when a case is allowed to sit too long.

And sometimes, the truth doesn’t come until years after everyone stops looking.

Ref:

https://abcnews.go.com/amp/US/california-familys-disappearance-ended-grisly-desert-discovery/story?id=125815324

https://podcasts.apple.com/us/podcast/20-20/id987967575?i=1000730088528

https://people.com/mcstay-family-vanished-desert-graves-abc-episode-11823394

https://www.nbcsandiego.com/news/local/charles-merritt-mcstay-family-murders-search-warrants-unsealed/52907/?amp=1

https://www.oxygen.com/true-crime-buzz/what-clue-revealed-mcstay-familys-killer-as-charles-merritt