It probably happens more that Americans are killed in Italy, I'm not ripping Italy on this. It happens. There was a student I read about. I'd really have to get the article... and then, I read of another story not that long ago.
This is probably why this is a rather shocking story, because stories of Americans killing abroad are rare and let's not count, say the odd story on a member of the military doing it in Okinawa or somewhere.