Posted at: 12/13/2007 06:15:35 PM

Updated at: 03/26/2008 08:11:06 AM

By: Nicole Muehlhausen, Web Producer

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Mystery illness cripples former marathoner

Heidi McFarlane used to run marathons. Now she can’t walk and she can’t talk and in these times of breakthroughs, no one knows why. Press play on the right to watch our report...