Marybeth Tinning murdered each of her children in cold blood. The motive was that she enjoyed the sympathy and attention she received when her children brought to the hospital.The causes of death for Tinning's first eight children was initially thought to be genetic. Even when her sixth child, Michael – who was <a href="https://en.wikipedia.org/wiki/Adoption" target="_blank" rel="noreferrer noopener">adopted</a> and not of blood relation – died in 1981, authorities failed to open an investigation.
