Identifying all of the skeletons found under Gacy's house will take years, but by reading the clues in the bones, forensic anthropologists can tell what kind of person the Killer Clown targeted.

Measuring Time with Maggots

Jun 22nd, 2012 3m 38s

In 1935, when decomposing body parts were found under a bridge, maggots were used to determine time-of-death and bugs became evidence for the first time.

Investigating Insects and Alibis

Jun 22nd, 2012 3m 11s

With only tiny insect fragments from the radiator in Vincent Brothers' car, bug experts can prove his alibi is a lie.

Behind the Scenes: Recreating the 80s

Jun 22nd, 2012 3m 14s

Join executive producer Annie Paterno and director Jay Dahl on the set of Catching Killers to see how recreating an investigation is all about the details - right down to the clunky computers and office supplies.

An Innocent Man on Death Row

Jun 22nd, 2012 3m 12s

In the first case using ballistic evidence, the validity of ballistics as a forensic science was called into question when an "expert witness" lied on the stand and sent an innocent man to death row.

Where Do Fingerprints Come From?

Jun 22nd, 2012 2m 25s

From cradle to grave, no matter how much fingers grow, everyone's fingerprints are unique and unchanging.

All Signs Point to Innocent

Jun 22nd, 2012 3m 15s

In 1983, police in Leicestershire, England struggle to make their case - until they join forces with scientists, who are just discovering the potential of DNA profiling.

The Sniper's Bullets

Jun 15th, 2012 2m 53s

After multiple shootings, the only evidence in the DC Sniper case are bullet fragments pulled from the victims. Luckily, scientists can use those to answer vital questions about the killer's weapon.

Murder or Cholera?

Jun 15th, 2012 3m 14s

In 1840, a murder case hinges on whether a man died of cholera or arsenic-poisoning, and for the first time ever, scientists are called in to test his remains.

Skeletons in the Smithsonian Collection

Jun 15th, 2012 3m 1s

Forensic investigation is nothing new to Smithsonian's National Museum of Natural History. Their collection of donated human skeletons has been used to solve crimes.

Behind the Scenes: How to Play Dead

May 23rd, 2012 1m 35s

Playing a corpse isn't easy, but Hannah Sarrouy, who played a dead girl in Catching Killers, is now a master of the "dead face."

Shining Light on the Evidence

May 23rd, 2012 3m 15s

The Night Stalker investigation was blown wide open when - for the first time ever - a laser was used to illuminate latent fingerprints.

Traces of a Serial Killer

May 23rd, 2012 2m 46s

When BTK started killing, using DNA evidence wasn't the norm. But 20 years later, tiny traces of DNA left on his first victims could be enough to bring him to justice.

Dr. Death's Invisible Poison

May 23rd, 2012 3m 23s

With Michael Swango in custody for fraud, it's up to the scientists to figure out how he killed his patients - before his sentence is up and he gets another chance to escape.

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