Daredevil tightrope walker Nik Wallenda is planning to walk over the Chicago River in Illinois untethered as part of a Tv event in November (14). Wallenda, who previously crossed Niagara Falls as part of a televised stunt, will walk between Chicago's West Tower and the Leo Burnett Building and then from the Windy City's West Tower to the East Tower. The stunt will air live on The Discovery Channel.