How's about a spot of tea, love? Join Melanie as she takes you through the case of Mary Ann Cotton, Britain's most prolific female serial killer who used her looks and charm to wed men, bear their children, and then poison them with arsenic to cash in on the insurance policies. 
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RESOURCES 
https://www.britannica.com/biography/Mary-Ann-Cotton 
http://www.capitalpunishmentuk.org/Mary_Ann_Cotton.html 
https://www.chroniclelive.co.uk/news/history/who-was-mary-ann-cotton-11503447 
http://www.maryanncotton.co.uk/ 
https://murderpedia.org/female.C/c/cotton-mary-ann.htm 
https://www.radiotimes.com/news/2019-06-18/dark-angel-how-were-mary-ann-cottons-terrible-crimes-uncovered/ 
https://community.dur.ac.uk/4schools.resources/Crime/MACottoninfo.htm