William George Davis, a nurse in Tyler, Texas, was just 32 when he began a reign of terror over patients recovering from heart surgery. Prosecutors claimed that Davis had at least eleven victims, of whom seven died.

From February to April 1991, Beverley Allitt's reign of terror at Grantham Hospital led to the deaths of four children and serious harm to many others. Her background revealed troubling signs of Munchausen's syndrome, manifesting at an early age.