If this window opened into 'dead space' - and was found open the morning of December 26, wouldn't the logical conclusion be that an intruder opened it from inside the house, looking for a means of exit?The suitcase was found under the grated window with the broken windowpane. A small piece of glass was found on top of the suitcase, placed there by Fleet White, I believe. There is much more, including crime scene pictures of the suitcase, glass and grated window, in the Rocky Mountain News article, 'Clues in the Case.'
http://www.rockymountainnews.com/drmn/local/article/0,1299,DRMN_15_408302,00.html