Melissa Ramirez, Claudine Anne Luera, Guiselda Hernandez, and Janelle Ortiz were four marginalized women striving to make ends meet as sex workers. They looked out for one another. But they would soon share a connection that none of them could have imagined. When Melissa was found dead, the other three women were on edge but assumed they were safe. Twelve days later, they too were dead and police had detained an unlikely suspect—Juan David Ortiz, a ten-year veteran of the U.S. Customs and Border Protection.

The disappearance of a twenty-one-year-old woman from a Massachusetts suburb became one of the most discussed crimes of the twentieth century.

When Gregory M. Cooper, former head of the FBI's Behavioral Sciences Unit, founded the Cold Case Foundation in 2013, he had high expectations, but couldn't anticipate the level of response. What started with just a half-dozen or so retired FBI agents and homicide detectives has ballooned to more than 150 women and men who volunteer their time to help families of deceased or missing loved ones bring closure to cases that have gone "cold."

The fair sex. We've often heard this cliched expression being used to refer to women. Although it has become increasingly outdated, the mindset still exists that women are the gentle and nurturing sex. When it comes to murder, that notion gets turned on its head. And this isn't a recent phenomenon; we can find plenty of female killers going back in history. In fact, some of the world's most notorious serial killers have been women. These female killers give their male counterparts a run for their money and deserve to be counted among the most famous serial killers.

Investigative reporter James Renner reopens cold cases that have baffled Clevelanders for years.