All Signs Point to Innocent

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

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.

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.