Samuel Little was the nation's most prolific serial killer between 1970 and 2005. He left a trail of victims from coast to coast. The police and the FBI worked for decades to crack the case but one stupid mistake did Little in.

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Sources:
https://www.fbi.gov/news/stories/samuel-little-most-prolific-serial-killer-in-us-history-100619

https://www.oxygen.com/catching-a-serial-killer-sam-little