A rare form of serial killer are Black Widows - women who kill their spouses and other family members - usually for financial gain. Even more rare are Black Widow Sisters. This week I'll share two stories of sisters who set up murder syndicates for profit.
#BlackWidowsofLiverpool #BlackWidowsofElSalvador #serialkillers
Photo: Margaret Higgins and Catherine Flanagan - The Black Widows of Liverpool