5. Jill Coit

https://www.crimemuseum.org/crime-library/famous-murders/jill-coit/
https://forensicfilesnow.com/index.php/2018/11/30/jill-coit-what-a-snow-job/
https://murderpedia.org/female.C/c/coit-jill.htm
https://www.latimes.com/archives/la-xpm-1993-12-26-mn-5678-story.html
https://www.steamboatpilot.com/news/backus-says-hes-innocent/

4. Betty Neumar

https://murderpedia.org/female.N/n/neumar-betty.htm
https://murderpedia.org/female.N/n/neumar-betty-photos.htm
https://www.wrdw.com/home/headlines/19199519.html
https://www.cleveland.com/metro/2011/06/mystery_surrounds_ohio_native.html
https://www.findagrave.com/memorial/71355088/betty-neumar
https://www.wbtv.com/story/8671062/judge-denies-bond-for-betty-neumar/
https://www.thestar.com/news/world/2008/07/15/the_two_faces_of_betty_neumar.html
https://books.google.ca/books?id=f8PNAgAAQBAJ&lpg=PP1&dq=Betty%20Neumar&pg=PP1#v=onepage&q=Betty%20Neumar&f=false
https://books.google.ca/books?id=glDxswEACAAJ&dq=Betty+Neumar&hl=en&sa=X&ved=0ahUKEwjN09XzjI7kAhWEdt8KHZ_4COgQ6AEIKjAA

3. Lydia Trueblood

https://books.google.ca/books?id=Nwi5tAEACAAJ&dq=Lyda+Trueblood&hl=en&sa=X&ved=0ahUKEwj07c_TjY7kAhXJVN8KHeHrAR0Q6AEIKjAA
https://www.crimemuseum.org/crime-library/famous-murders/lydia-trueblood/
https://murderpedia.org/female.T/t/trueblood-lyda.htm

2. Chisako Kakehi

https://www.abc.net.au/news/2014-12-10/black-widow-charged-in-japan-over-death-of-husband-no-four/5959056
https://www.theguardian.com/world/2014/nov/20/millionaire-widow-seven-dead-partners-arrested-japan-poison
https://www.nytimes.com/2014/12/09/world/a-black-widow-case-strikes-a-nerve-in-japan.html
https://www.independent.co.uk/news/world/asia/japans-new-black-widow-arrested-after-sixth-former-partner-dies-in-suspicious-circumstances-9869481.html
https://www.mercurynews.com/2014/11/20/japans-black-widow-police-search-for-poison-in-home-of-woman-with-many-dead-partners/
https://www.telegraph.co.uk/news/worldnews/asia/japan/11242445/Black-widow-investigated-after-deaths-of-seven-partners.html
https://www.bbc.com/news/world-asia-30125055
https://www.standardmedia.co.ke/evewoman/article/2000141910/woman-who-killed-6-husbands-finally-caught-after-murdering-7th-husband-for-millions-in-insurance
https://www.cnn.com/2014/11/21/world/asia/japan-black-widow-murder/index.html
https://www.news.com.au/lifestyle/relationships/marriage/japanese-black-widow-suspected-of-killing-six-partners-had-cyanide-in-plant-pots/news-story/e60feea8c541be93b90d912a55b3d531
https://www.deccanherald.com/content/442910/japan-black-widow-still-hunt.html
https://www.straitstimes.com/asia/east-asia/japans-black-widow-still-on-hunt-for-single-elderly-ill-men-as-husband-no-4-died
https://www.straitstimes.com/asia/east-asia/traces-of-cyanide-found-in-potted-plants-of-japans-black-widow-reports

1. Ottilie Gburek

http://mentalfloss.com/article/24118/7-black-widows-and-16-dead-husbands
https://murderpedia.org/female.K/k/klimek-tillie.htm
https://books.google.ca/books?id=Z0aoDAEACAAJ&dq=Tillie+Klimek&hl=en&sa=X&ved=0ahUKEwjo5JCUj47kAhXxY98KHVkhB5EQ6AEIKjAA
https://books.google.ca/books?id=-s6iDwAAQBAJ&lpg=PT232&dq=Tillie%20Klimek&pg=PT232#v=onepage&q=Tillie%20Klimek&f=false