Some people who take in interest in genealogy discover that they are Irish when they thought they were Scottish. Others find a long-lost cousin. When Craig Calcaterra began looking at his family history he found out that his great-great grandmother murdered his great-great grandfather with an axe on a snowy winter's night in Detroit, Michigan in 1910. Nellie Kniffen's violent rampage and her husband Frank's grisly demise was front page news in Detroit...