5. The Castration Murders

https://books.google.ca/books?id=gijG7fSwvjAC&lpg=PA70&dq=the%20castration%20murders&pg=PA70#v=onepage&q=the%20castration%20murders&f=false
http://www.dreamindemon.com/community/threads/castration-serial-murders-someone-was-collecting-genitals-had-to-kill-them-first.52157/

4. The Texarkana Moonlight Murders

http://www.the-line-up.com/texarkana-murders/
http://txktoday.com/news/phantom-killer-brings-terror-to-texarkana-69-years-ago-tonight/
http://www.texasmonthly.com/the-culture/texarkana-murder-mystery/

3. The Toledo Clubber

https://books.google.ca/books?id=9crABAAAQBAJ&lpg=PT238&dq=the%20toledo%20clubber&pg=PT238#v=onepage&q=the%20toledo%20clubber&f=false
https://books.google.ca/books?id=gijG7fSwvjAC&lpg=PA364&dq=the%20toledo%20clubber&pg=PA364#v=onepage&q&f=false

2. The Zodiac

http://www.zodiackiller.com/AllenFile.html
http://www.biography.com/people/zodiac-killer-236027
https://vault.fbi.gov/The%20Zodiac%20Killer/The%20Zodiac%20Killer%20Part%2001%20of%2006%20./view

1. The Original Night Stalker

https://books.google.ca/books?id=3z0FogEACAAJ&dq=the+original+night+stalker&hl=en&sa=X&ved=0ahUKEwi6nMXv86rPAhUl94MKHUOVB0wQ6AEIHDAA
https://www.fbi.gov/news/stories/help-us-catch-the-east-area-rapist
http://www.ear-ons.com/investigate.html