Serial killer Gary Ridgeway murdered more than 50 women over two decades before he was caught. An advancement in forensic microscopy cracked open the case.

In 1999, a woman's body was found in a barrel with a decades-old address book. A game-changing technology called spectral imaging recovered key information.

In 2002, detectives hit a dead end in a rape case. Five years later, a groundbreaking DNA system helped authorities begin an epic hunt for the culprit.

In 1986, the LAPD attempted to track down a killer. Twenty years later, the advent of DNA testing provided a stunning new lead: the killer was a woman.

A bomb went off at the 1996 Atlanta Olympics, killing one and injuring hundreds. Authorities used every tool at their disposal to bring the bomber to justice.

A body was found inside a burnt antique trunk in the Nevada desert. Despite modern forensic tools, it was an old-school method that helped convict the killer.