Michigan's strychnine saint :  the curious case of Mrs. Mary McKnight

Summary: The spring of 1903 proved disastrous for the Murphy family. On April 22, the infant Ruth Murphy died in her crib. Within an hour, her mother, Gertrude, experienced a violent spasm before she, too, died. Ten days later, John Murphy followed his wife and child to the grave after suffering from a crippling convulsion. While neighbors whispered about a curse and physicians feared a contagious disease, Kalkaska County sheriff John W. Creighton and prosecuting attorney Ernest C. Smith searched for answers. As they probed deeper into the suspicious deaths, they uncovered a wicked web of intrigue. And at the center stood a widow in a black taffeta dress.