When Sonya Ivanoff is found shot to death near the remote village of Nome, Alaska, detectives rely on forensic science to catch her murderer.

When 80-year-old Dorothy Murphy is murdered after leaving to running errands. Investigators discover her case is tied to an unsolved drive-by shooting.

In the late 1980s, an elusive serial killer stalks the streets of South Central Los Angeles, raping, murdering and discarding his victims; two decades later, clever police work and new technology put an end to The Grim Sleeper's reign of terror.

When a little girl disappears from a small Washington town over a Fourth of July weekend, detectives look at suspects close to home; then her body is found two weeks later, and a tip leads investigators to a trusted friend with a terrifying past.

The torture and murder of a mother shakes the community of Newton to its core. When another woman goes missing, police learn that the cases might be linked.

When a mother is murdered in the night, her sadistic killer left no evidence behind. Then, months later an attack in another state seems to be by the same person.