Mamah Borthwick Cheney and Two Children Murdered

On August 15, 1914, one of Wright's recently hired domestic workers, Julian Carlton, murdered Mamah, her two children, three of Wright's associates, and a son of one of the associates. Carlton set fire to one wing of Wright's house, Taliesin, and then he hacked the seven people with an ax while it burned. At the time, Wright was overseeing work on Midway Gardens in Chicago, Illinois.

http://en.wikipedia.org/wiki/Mamah_Borthwick