wasn't really investigated as a homicide. >> eventually, brown confessed to 48 murders, including one he committed while serving in the u.s. military in south korea. investigators around the country are still trying to corroborate brown's claims. if true, brown may be one of the most prolific serial killers in american history. and he might still be free if it weren't for the local fingerprint databases in louisiana and california and the investigators who knew where to look. >> you just don't know sometime how just a little clue, just a little fingerprint and, will, will lead you right directly to the killer. >> they wouldn't have been able to find brown without those forensics. that fingerprint was the thing that nailed the nail in the