Some women who vow to “love, honor, and cherish” end up violating those vows in a deadly manner. These stories of women who kill their men have some eerie similarities. A man dies, and someone notices his wife had already lost a husband or two due to a similar illness. An investigation reveals that each man had the same poison in his system. That’s the story of the human black widow. Read about six of them in this article I wrote for mental_floss.