The apartment was locked. Outside, snow was falling across Philadelphia. Inside, 27-year-old Ellen Greenberg lay dead on her kitchen floor.

She had 20 stab wounds to her body. What happened next would spark a debate that has lasted more than a decade. Investigators changed their conclusions, forensic experts disagreed, and Ellen's parents began a relentless fight to uncover the truth.

What really happened to Ellen Greenberg? Was this a tragic suicide, or does one of America's most baffling death investigations still have crucial questions left unanswered?

A hundred miles an hour. No skid marks. No attempt to brake.

In the early hours of a summer morning in Strongsville, Ohio, a car carrying three young people slammed into a brick building with devastating force.

At first, people assumed it was a tragic accident. But as investigators dug deeper into the wreckage, examined phone records, and uncovered the turbulent relationship at the middle of the case, a far darker picture began to emerge.

was this a catastrophic mistake... or cold blooded murder?

She was 19 years old, ambitious, bright, and stepping into what should have been the beginning of her life. But after a first date on a spring evening in Milwaukee, Sade Robinson vanished without a trace.

She left behind a trail of disturbing clues that would unravel into one of the most horrifying murder investigations the city had seen in years..