Cold Case Files: DNA Speaks

When 14-year-old Nacole Smith is brutally murdered in 1995 on a wooded path in Atlanta, the police and community rally around her mother as she seeks justice; it will take decades and a second brutal assault to finally reveal Nacole's killer.

When Susan Woods, 30, is found drowned in her tub in Stephenville, Texas, suspicion falls on her estranged husband. With a suspect's DNA in hand, detectives go back to the basics to unmask a killer cowboy living in plain sight.

When jewelry seller Minerva Cantu, 26, is found lifeless in her home, police suspect robbery as the motive. But who killed this mother as her infant slept in the next room is a mystery that would haunt one detective for 20 years.

When teens Llianna Adank and Eric Goldstrand are found shot to death at an Oregon park in 1977, every parent's nightmare comes true.

When Mary Scott, 23, is found murdered in her San Diego home in 1969, a case with few leads quickly loses steam. Years later, Mary's daughters grow determined to find answers.