History of St. Valentine

https://www.history.com/this-day-in-history/st-valentine-beheaded

https://www.willowandthatch.com/victorian-edwardian-era-valentines/

1837 James Greenacre and Sarah Gale

https://www.exclassics.com/newgate/ng622.htm

https://curiosity.lib.harvard.edu/studies-in-scarlet/catalog/41-990043871030203941

https://en.wikipedia.org/wiki/James_Greenacre

https://thebigsmoke.com.au/2018/05/16/nudity-riots-and-rebellion-harpies-first-female-penal-colonies-history/

The Invention of Murder by Judith Flanders https://g.co/kgs/FcMBek

1845 John Tawell “Kwaker Killer” killed mistress, executed

https://www.btp.police.uk/about_us/our_history/crime_history/murder_of_sarah_hart_1845.aspx

https://en.wikipedia.org/wiki/John_Tawell

1849 Bermondsey Horror killer couple Maria and Frederick Manning

https://u.osu.edu/kneffler2research/2019/06/15/the-bermondsey-horror/

1886 Mabbitt Mystery http://www.bizarrejournal.com/2015/07/the-strange-disappearance-of-luella.html

http://www.murderbygaslight.com/2018/05/the-mabbitt-mystery.html

1888 Henry W. King, Elizabeth Beechler King http://www.murderbygaslight.com/2018/04/i-have-shot-my-husband.html

1910-17 Amy Archer Gilligan black widow

https://alchetron.com/Amy-Archer-Gilligan

https://windsorhistoricalsociety.org/amy-archer-gilligan-entrepreneurism-gone-wrong-in-windsor/

1949 Fernandez and Martha Beck declarations of love

https://murderpedia.org/female.B/b/beck-martha.htm

https://en.wikipedia.org/wiki/Raymond_Fernandez_and_Martha_Beck

1954 Parker-Hulme 

Heavenly Creatures

https://nzhistory.govt.nz/parker-hulme-murder

http://christchurchcitylibraries.com/heritage/digitised/parkerhulme/Page23.asp

1957-58 Starkweather and Fugate https://www.wyohistory.org/encyclopedia/killing-spree-transfixed-nation-charles-starkweather-and-caril-fugate-1958

https://www.washingtonpost.com/nation/2020/01/30/starkweather-girlfriend-pardon/

1963-65 Ian Brady and Myra Hindley

https://www.nytimes.com/2017/05/17/world/europe/moors-murders-ian-brady-myra-hindley-victims.html

https://www.independent.co.uk/news/uk/home-news/myra-hindley-ian-brady-documents-papers-moors-murders-diary-a8547366.html

https://www.thesun.co.uk/news/6988064/moors-murder-victim-stilettos-returned/

1967-87 Fred and Rose West

https://murderpedia.org/male.W/w/west-frederick-victims.htm

https://www.bbc.com/news/uk-england-gloucestershire-57182844

https://www.independent.co.uk/news/uk/crime/fred-rose-west-what-happened-victims-b1920716.html