Texas Ranger Brandon Bess was greatly impacted by the case of Mary Catherine Edwards, a young schoolteacher who was tragically murdered in her own home.

Edwards was found handcuffed, sexually assaulted, and murdered.

Investigators suspected someone she knew was involved due to no signs of forced entry.

DNA evidence proved crucial in solving the case, leading to the identification and arrest of Clayton Foreman, a former boyfriend of Edwards' friend.

Foreman was found guilty and sentenced to life in prison for Edwards' murder.

The case highlighted the importance of forensic science and genetic genealogy in bringing closure to victims' families.

In 1977, Rodney Alcala killed Christine Thornton after meeting her and traveling with her in Wyoming.

The case remained cold for years until DNA evidence linked Christine to Kathy Thornton.

Alcala was questioned in prison but denied killing Christine.

Prosecutors believed his acknowledgment of being with her was a confession, and charged him with first-degree murder.

Despite his age and health, Alcala remained a manipulator.

With his execution on hold, he died of natural causes in 2021.

Kathy Thornton finally found closure, but detectives suspect Alcala may have more victims yet to be discovered.

Tech journalist Carl Miller uncovers a chilling Kill List on a dark web murder-for-hire site, targeting hundreds of innocent people. With police refusing to investigate, Carl races to warn the victims and expose the shadowy forces behind the plot.