'Madness of Two' syndrome may be used in Slender Man stabbing case

One of the suspects in the Slender Man stabbing case takes a unique defense.

Our Milwaukee affiliate, WISN, learns through court filings that Anissa Weier's defense says she was influenced by Morgan Geyser's schizophrenia to such a degree that she became mentally ill herself.

It's a rare syndrome named Folie a Deux, translates to English as "madness of two."

Weier and Geyser are both being tried as adults for attempted homicide after police say they stabbed a classmate 19 times to please a fictional character Slender Man.  The girl survived.

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