William Archerd (CC BY-SA 4.0)

Karen:

"The Insulin Killer"

Episode sources:

1. “William Archerd: a serial matrimonialist killer” by Vincent Marks and Caroline Richmond (Journal of the Royal Society of Medicine) 2008

2. “Hospital Worker Indicted in Murder of 2 Wives, Nephew” by Ron Einstoss (LA Times) 1967

3. “Nation: One Coincidence Too Many” no author listed (Time) 1967

4. “People v. Archerd” (Justia US Law) 1970

5. “William Dale Archerd” (Murderpedia)

6. “William Dale Archerd” (Wikipedia)

Georgia:

Fredericka "Mother" Mandelbaum

Episode sources:

1. “The Life and Crimes of ‘Old Mother’ Mandelbaum” by Karen Abbott (Smithsonian Mag)

2. “’Marm’ Mandelbaum: Queen of the Fences” by Allan Levine (Tablet Magazine)

3. “Mother Mandelbaum, New York’s Smartest Female Felon” by Peter Carlson (Historynet)

4. “Marm Mandelbaum: The Queen of Crooks” by Rupert Taylor (Owlcation)

5. “Fredericka Mandelbaum” (Wikipedia)

6. “Panic of 1857” (Wikipedia)

Fredericka "Mother" Mandelbaum