on this sunday night, winter comes early. an arctic blast slams the east coast bringing with it heavy snow, high winds and record low temperatures. the investigation. the first fatal crash of a commercial space plane presents new challenges to investigators. tonight what the ntsb is telling nbc news. line of fire, so close you could almost touch it. an up close look of the molten river man is powerless to stop. and the high defying death rope walk tonight high above the windy city.