Hi All,
This is a very sad situation. I'm presuming that it was the main rotor blade that struck the pilot. A number of years ago I began telling my passengers to never walk around the back of a helicopter regardless of whether the rotors were in motion or not.
Similarly, I also have my own rule of never walking round the back of any helicopter unless I'm conducting my checks. Many times I've stopped myself from walking around the tail or under the tail boom and reversed direction just to ensure I stick with my rules.
I also remind any passengers that dis-embark whilst the rotors are in motion to ensure they exit forwards and outwards. I do this even if they are pilots which most of them are.
Joel