He looks like he just stepped from the pages of a catalogue, with a stylish, dark jacket, tousled hair and cool nonchalance as he glides down an escalator to a marbled landing, casually typing a message into a cell phone. But the young man caught on surveillance tapes isn’t another tourist or businessman. He is, police believe, an unlikely killer near an equally unlikely murder scene, the 20th floor of an upscale Back Bay hotel. And as authorities launched a hunt for the man -- also captured on surveillance cameras last week at the Westin Hotel, where a 29-year-old Las Vegas woman was bound and robbed at gunpoint -- the killing opened a window on the elusive underworld of prostitutes who advertise online and do business at high-end hotels. (more at link) http://www.boston.com/news/local/breaking_news/2009/04/police_woman_ki.html One of the four photos released by Boston police. To see all four, click here.